From 4350f484da9132cb8f7f6b4e256f8678c0959688 Mon Sep 17 00:00:00 2001
From: Abubakar Meigag <113248042+Abubakar-Meigag@users.noreply.github.com>
Date: Wed, 11 Mar 2026 17:31:33 +0000
Subject: [PATCH 01/15] Fix expected output in sed exercise instructions (#353)

Fix expected output: change 'with' to 'wIth' in sed exercise
instructions
---
 individual-shell-tools/sed/script-01.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/individual-shell-tools/sed/script-01.sh b/individual-shell-tools/sed/script-01.sh
index 3eba6fa..d592970 100755
--- a/individual-shell-tools/sed/script-01.sh
+++ b/individual-shell-tools/sed/script-01.sh
@@ -4,4 +4,4 @@ set -euo pipefail
 
 # TODO: Write a command to output input.txt with all occurrences of the letter `i` replaced with `I`.
 # The output should contain 11 lines.
-# The first line of the output should be: "ThIs Is a sample fIle for experImentIng with sed.".
+# The first line of the output should be: "ThIs Is a sample fIle for experImentIng wIth sed.".

From 743e4911fb9de80d1c5934bdc857738d9f60ed7e Mon Sep 17 00:00:00 2001
From: LonMcGregor <3817332+LonMcGregor@users.noreply.github.com>
Date: Mon, 11 May 2026 10:28:21 +0100
Subject: [PATCH 02/15] Automate testing of initial sprints in tools module
 (#472)

* Expected output now in expected folder
* Github action which runs after validation, when Needs Review
* Script that can be run to test locally before push
* Split number sys qs into automatable/manualy checkable

---------

Co-authored-by: l <l>
---
 .github/workflows/validate-pr-metadata.yml    |  57 +++++++-
 .gitignore                                    |   1 +
 .../individual-shell-tools/awk/script-01.sh   |   6 +
 .../individual-shell-tools/awk/script-02.sh   |   6 +
 .../individual-shell-tools/awk/script-03.sh   |   6 +
 .../individual-shell-tools/awk/script-04.sh   |   3 +
 .../individual-shell-tools/awk/script-05.sh   |   6 +
 .../awk/script-06-stretch.sh                  |   1 +
 .../awk/script-07-stretch.sh                  |   6 +
 .../individual-shell-tools/cat/script-01.sh   |   1 +
 .../individual-shell-tools/cat/script-02.sh   |   5 +
 .../individual-shell-tools/cat/script-03.sh   |   3 +
 .../cat/script-04-stretch.sh                  |   5 +
 .../individual-shell-tools/grep/script-01.sh  |   6 +
 .../individual-shell-tools/grep/script-02.sh  |   9 ++
 .../individual-shell-tools/grep/script-03.sh  |   1 +
 .../individual-shell-tools/grep/script-04.sh  |  10 ++
 .../individual-shell-tools/grep/script-05.sh  |   5 +
 .../individual-shell-tools/grep/script-06.sh  |   2 +
 .../individual-shell-tools/grep/script-07.sh  |   3 +
 expect/individual-shell-tools/ls/script-01.sh |   5 +
 expect/individual-shell-tools/ls/script-02.sh |   3 +
 expect/individual-shell-tools/ls/script-03.sh |  11 ++
 expect/individual-shell-tools/ls/script-04.sh |   8 ++
 .../individual-shell-tools/sed/script-01.sh   |  11 ++
 .../individual-shell-tools/sed/script-02.sh   |  11 ++
 .../individual-shell-tools/sed/script-03.sh   |   6 +
 .../individual-shell-tools/sed/script-04.sh   |  11 ++
 .../individual-shell-tools/sed/script-05.sh   |  11 ++
 .../individual-shell-tools/sed/script-06.sh   |  11 ++
 expect/individual-shell-tools/wc/script-01.sh |   1 +
 expect/individual-shell-tools/wc/script-02.sh |   1 +
 expect/individual-shell-tools/wc/script-03.sh |   4 +
 expect/jq/script-01.sh                        |   1 +
 expect/jq/script-02.sh                        |   1 +
 expect/jq/script-03.sh                        |   2 +
 expect/jq/script-04.sh                        |   6 +
 expect/jq/script-05.sh                        |   6 +
 expect/jq/script-06.sh                        |   6 +
 expect/jq/script-07.sh                        |   6 +
 expect/jq/script-08.sh                        |   6 +
 expect/jq/script-09.sh                        |   6 +
 expect/jq/script-10.sh                        |   1 +
 expect/jq/script-11.sh                        |   1 +
 expect/number-systems/Part-1.json             |   1 +
 expect/shell-pipelines/ls-grep/script-01.sh   |  11 ++
 expect/shell-pipelines/ls-grep/script-02.sh   |  10 ++
 expect/shell-pipelines/ls-grep/script-03.sh   |   7 +
 expect/shell-pipelines/ls-grep/script-04.sh   |   1 +
 .../sort-uniq-head-tail/script-01.sh          |   6 +
 .../sort-uniq-head-tail/script-02.sh          |   6 +
 .../sort-uniq-head-tail/script-03.sh          |   3 +
 .../sort-uniq-head-tail/script-04.sh          |   1 +
 .../sort-uniq-head-tail/script-05.sh          |   6 +
 .../sort-uniq-head-tail/script-06.sh          |   2 +
 .../sort-uniq-head-tail/script-07.sh          |   2 +
 expect/shell-pipelines/tr/script-01.sh        |  11 ++
 expect/shell-pipelines/tr/script-02.sh        |  11 ++
 number-systems/Part-1.md                      |  54 +++++++
 number-systems/Part-2.md                      |  22 +++
 number-systems/README.md                      |  65 ---------
 test-sdc.sh                                   | 132 ++++++++++++++++++
 62 files changed, 561 insertions(+), 68 deletions(-)
 create mode 100755 expect/individual-shell-tools/awk/script-01.sh
 create mode 100755 expect/individual-shell-tools/awk/script-02.sh
 create mode 100755 expect/individual-shell-tools/awk/script-03.sh
 create mode 100755 expect/individual-shell-tools/awk/script-04.sh
 create mode 100755 expect/individual-shell-tools/awk/script-05.sh
 create mode 100755 expect/individual-shell-tools/awk/script-06-stretch.sh
 create mode 100755 expect/individual-shell-tools/awk/script-07-stretch.sh
 create mode 100755 expect/individual-shell-tools/cat/script-01.sh
 create mode 100755 expect/individual-shell-tools/cat/script-02.sh
 create mode 100755 expect/individual-shell-tools/cat/script-03.sh
 create mode 100755 expect/individual-shell-tools/cat/script-04-stretch.sh
 create mode 100755 expect/individual-shell-tools/grep/script-01.sh
 create mode 100755 expect/individual-shell-tools/grep/script-02.sh
 create mode 100755 expect/individual-shell-tools/grep/script-03.sh
 create mode 100755 expect/individual-shell-tools/grep/script-04.sh
 create mode 100755 expect/individual-shell-tools/grep/script-05.sh
 create mode 100755 expect/individual-shell-tools/grep/script-06.sh
 create mode 100755 expect/individual-shell-tools/grep/script-07.sh
 create mode 100755 expect/individual-shell-tools/ls/script-01.sh
 create mode 100755 expect/individual-shell-tools/ls/script-02.sh
 create mode 100755 expect/individual-shell-tools/ls/script-03.sh
 create mode 100755 expect/individual-shell-tools/ls/script-04.sh
 create mode 100755 expect/individual-shell-tools/sed/script-01.sh
 create mode 100755 expect/individual-shell-tools/sed/script-02.sh
 create mode 100755 expect/individual-shell-tools/sed/script-03.sh
 create mode 100755 expect/individual-shell-tools/sed/script-04.sh
 create mode 100755 expect/individual-shell-tools/sed/script-05.sh
 create mode 100755 expect/individual-shell-tools/sed/script-06.sh
 create mode 100755 expect/individual-shell-tools/wc/script-01.sh
 create mode 100755 expect/individual-shell-tools/wc/script-02.sh
 create mode 100755 expect/individual-shell-tools/wc/script-03.sh
 create mode 100755 expect/jq/script-01.sh
 create mode 100755 expect/jq/script-02.sh
 create mode 100755 expect/jq/script-03.sh
 create mode 100755 expect/jq/script-04.sh
 create mode 100755 expect/jq/script-05.sh
 create mode 100755 expect/jq/script-06.sh
 create mode 100755 expect/jq/script-07.sh
 create mode 100755 expect/jq/script-08.sh
 create mode 100755 expect/jq/script-09.sh
 create mode 100755 expect/jq/script-10.sh
 create mode 100755 expect/jq/script-11.sh
 create mode 100644 expect/number-systems/Part-1.json
 create mode 100755 expect/shell-pipelines/ls-grep/script-01.sh
 create mode 100755 expect/shell-pipelines/ls-grep/script-02.sh
 create mode 100755 expect/shell-pipelines/ls-grep/script-03.sh
 create mode 100755 expect/shell-pipelines/ls-grep/script-04.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-01.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-02.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-03.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-04.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-05.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-06.sh
 create mode 100755 expect/shell-pipelines/sort-uniq-head-tail/script-07.sh
 create mode 100755 expect/shell-pipelines/tr/script-01.sh
 create mode 100755 expect/shell-pipelines/tr/script-02.sh
 create mode 100644 number-systems/Part-1.md
 create mode 100644 number-systems/Part-2.md
 delete mode 100644 number-systems/README.md
 create mode 100755 test-sdc.sh

diff --git a/.github/workflows/validate-pr-metadata.yml b/.github/workflows/validate-pr-metadata.yml
index 10ef3c7..8ff276f 100644
--- a/.github/workflows/validate-pr-metadata.yml
+++ b/.github/workflows/validate-pr-metadata.yml
@@ -1,9 +1,8 @@
-name: Validate PR Metadata
+name: Validate PR Metadata and Check SDC-Tools Tasks
 on:
-  pull_request_target:
+  pull_request:
     types:
       - labeled
-      - unlabeled
       - opened
       - edited
       - reopened
@@ -16,3 +15,55 @@ jobs:
       - uses: CodeYourFuture/actions/validate-pr-metadata@main
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  test_sdc_tasks:
+    name: Test SDC Tasks
+    runs-on: ubuntu-slim
+    permissions:
+      pull-requests: write
+    if: ${{ github.event.label.name == 'Needs Review' }}
+    steps:
+      - name: checkout base branch
+        uses: actions/checkout@v5
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v47.0.5
+      - name: test individual shell tools
+        id: test-individual-shell-tools
+        if: contains(steps.changed-files.outputs.modified_files, 'individual-shell-tools/')
+        run: ./test-sdc.sh individual-shell-tools
+        shell: bash
+      - name: test jq
+        id: test-jq
+        if: contains(steps.changed-files.outputs.modified_files, 'jq/')
+        run: ./test-sdc.sh jq
+        shell: bash
+      - name: test shell-pipelines
+        id: test-shell-pipelines
+        if: contains(steps.changed-files.outputs.modified_files, 'shell-pipelines/')
+        run: ./test-sdc.sh shell-pipelines
+        shell: bash
+      - name: test number-systems
+        id: test-number-systems
+        if: contains(steps.changed-files.outputs.modified_files, 'number-systems/')
+        run: ./test-sdc.sh number-systems
+        shell: bash
+      - name: make output comment
+        if: steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y' || steps.test-number-systems.outputs.attempted == 'y'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_URL: ${{ github.event.pull_request.html_url }}
+        run: |
+          gh pr comment $ISSUE_URL --body-file testoutput.txt
+      - name: add appropriate labels
+        if: steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ISSUE_URL: ${{ github.event.pull_request.html_url }}
+        run: |
+          gh pr edit $ISSUE_URL --add-label "Complete"
+          gh pr edit $ISSUE_URL --remove-label "Needs Review"
+      - name: fail if not complete
+        if: (steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y') && !(steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y')
+        run: |
+          exit -1
diff --git a/.gitignore b/.gitignore
index 3c3629e..c4234ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 node_modules
+testoutput.txt
diff --git a/expect/individual-shell-tools/awk/script-01.sh b/expect/individual-shell-tools/awk/script-01.sh
new file mode 100755
index 0000000..050f043
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-01.sh
@@ -0,0 +1,6 @@
+Ahmed
+Basia
+Mehmet
+Leila
+Piotr
+Chandra
diff --git a/expect/individual-shell-tools/awk/script-02.sh b/expect/individual-shell-tools/awk/script-02.sh
new file mode 100755
index 0000000..ee7e0fe
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-02.sh
@@ -0,0 +1,6 @@
+Ahmed London
+Basia London
+Mehmet Birmingham
+Leila London
+Piotr Glasgow
+Chandra Birmingham
diff --git a/expect/individual-shell-tools/awk/script-03.sh b/expect/individual-shell-tools/awk/script-03.sh
new file mode 100755
index 0000000..f5d0b1f
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-03.sh
@@ -0,0 +1,6 @@
+Ahmed 1
+Basia 22
+Mehmet 3
+Leila 1
+Piotr 15
+Chandra 12
diff --git a/expect/individual-shell-tools/awk/script-04.sh b/expect/individual-shell-tools/awk/script-04.sh
new file mode 100755
index 0000000..6e95a2f
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-04.sh
@@ -0,0 +1,3 @@
+Ahmed 4
+Basia 6
+Leila 1
diff --git a/expect/individual-shell-tools/awk/script-05.sh b/expect/individual-shell-tools/awk/script-05.sh
new file mode 100755
index 0000000..dd7e1d3
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-05.sh
@@ -0,0 +1,6 @@
+Ahmed 3
+Basia 3
+Mehmet 3
+Leila 1
+Piotr 5
+Chandra 2
diff --git a/expect/individual-shell-tools/awk/script-06-stretch.sh b/expect/individual-shell-tools/awk/script-06-stretch.sh
new file mode 100755
index 0000000..fb1e7bc
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-06-stretch.sh
@@ -0,0 +1 @@
+54
diff --git a/expect/individual-shell-tools/awk/script-07-stretch.sh b/expect/individual-shell-tools/awk/script-07-stretch.sh
new file mode 100755
index 0000000..33ff777
--- /dev/null
+++ b/expect/individual-shell-tools/awk/script-07-stretch.sh
@@ -0,0 +1,6 @@
+Ahmed 15
+Basia 37
+Mehmet 32
+Leila 1
+Piotr 61
+Chandra 18
diff --git a/expect/individual-shell-tools/cat/script-01.sh b/expect/individual-shell-tools/cat/script-01.sh
new file mode 100755
index 0000000..ed7bf7d
--- /dev/null
+++ b/expect/individual-shell-tools/cat/script-01.sh
@@ -0,0 +1 @@
+Once upon a time...
diff --git a/expect/individual-shell-tools/cat/script-02.sh b/expect/individual-shell-tools/cat/script-02.sh
new file mode 100755
index 0000000..769b7e0
--- /dev/null
+++ b/expect/individual-shell-tools/cat/script-02.sh
@@ -0,0 +1,5 @@
+Once upon a time...
+There was a house made of gingerbread.
+It looked delicious.
+I was tempted to take a bite of it.
+But this seemed like a bad idea...
diff --git a/expect/individual-shell-tools/cat/script-03.sh b/expect/individual-shell-tools/cat/script-03.sh
new file mode 100755
index 0000000..f97bd50
--- /dev/null
+++ b/expect/individual-shell-tools/cat/script-03.sh
@@ -0,0 +1,3 @@
+     1	It looked delicious.
+     2	I was tempted to take a bite of it.
+     3	But this seemed like a bad idea...
diff --git a/expect/individual-shell-tools/cat/script-04-stretch.sh b/expect/individual-shell-tools/cat/script-04-stretch.sh
new file mode 100755
index 0000000..6f35e89
--- /dev/null
+++ b/expect/individual-shell-tools/cat/script-04-stretch.sh
@@ -0,0 +1,5 @@
+     1	Once upon a time...
+     2	There was a house made of gingerbread.
+     3	It looked delicious.
+     4	I was tempted to take a bite of it.
+     5	But this seemed like a bad idea...
diff --git a/expect/individual-shell-tools/grep/script-01.sh b/expect/individual-shell-tools/grep/script-01.sh
new file mode 100755
index 0000000..bc96ffe
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-01.sh
@@ -0,0 +1,6 @@
+Doctor: Hello
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Doctor: You didn't say hello
+Doctor: You're welcome, goodbye
diff --git a/expect/individual-shell-tools/grep/script-02.sh b/expect/individual-shell-tools/grep/script-02.sh
new file mode 100755
index 0000000..bad606e
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-02.sh
@@ -0,0 +1,9 @@
+Doctor: Hello
+Patient: Hello Doctor
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Doctor: You didn't say hello
+Doctor: You're welcome, goodbye
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
diff --git a/expect/individual-shell-tools/grep/script-03.sh b/expect/individual-shell-tools/grep/script-03.sh
new file mode 100755
index 0000000..ec63514
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-03.sh
@@ -0,0 +1 @@
+9
diff --git a/expect/individual-shell-tools/grep/script-04.sh b/expect/individual-shell-tools/grep/script-04.sh
new file mode 100755
index 0000000..5814afa
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-04.sh
@@ -0,0 +1,10 @@
+Doctor: What's wrong today?
+Doctor: That sounds frustrating. When did this start?
+Doctor: Say "Hi".
+Patient: Hi
+Patient: I seem to be cured!
+Doctor: You're welcome, goodbye
+
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
+Patient: Yes!
diff --git a/expect/individual-shell-tools/grep/script-05.sh b/expect/individual-shell-tools/grep/script-05.sh
new file mode 100755
index 0000000..2ed07ed
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-05.sh
@@ -0,0 +1,5 @@
+Doctor: You didn't say hello
+Patient: I seem to be cured!
+--
+Patient: I went to the doctor!
+Spouse: I'm glad you saw the Doctor: did they cure you?
diff --git a/expect/individual-shell-tools/grep/script-06.sh b/expect/individual-shell-tools/grep/script-06.sh
new file mode 100755
index 0000000..87b3a4f
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-06.sh
@@ -0,0 +1,2 @@
+dialogue-2.txt
+dialogue.txt
diff --git a/expect/individual-shell-tools/grep/script-07.sh b/expect/individual-shell-tools/grep/script-07.sh
new file mode 100755
index 0000000..aed78c6
--- /dev/null
+++ b/expect/individual-shell-tools/grep/script-07.sh
@@ -0,0 +1,3 @@
+dialogue-2.txt:2
+dialogue-3.txt:0
+dialogue.txt:6
diff --git a/expect/individual-shell-tools/ls/script-01.sh b/expect/individual-shell-tools/ls/script-01.sh
new file mode 100755
index 0000000..dd590d6
--- /dev/null
+++ b/expect/individual-shell-tools/ls/script-01.sh
@@ -0,0 +1,5 @@
+child-directory
+script-01.sh
+script-02.sh
+script-03.sh
+script-04.sh
diff --git a/expect/individual-shell-tools/ls/script-02.sh b/expect/individual-shell-tools/ls/script-02.sh
new file mode 100755
index 0000000..bfd087e
--- /dev/null
+++ b/expect/individual-shell-tools/ls/script-02.sh
@@ -0,0 +1,3 @@
+helper-1.txt
+helper-2.txt
+helper-3.txt
diff --git a/expect/individual-shell-tools/ls/script-03.sh b/expect/individual-shell-tools/ls/script-03.sh
new file mode 100755
index 0000000..36acd71
--- /dev/null
+++ b/expect/individual-shell-tools/ls/script-03.sh
@@ -0,0 +1,11 @@
+.:
+child-directory
+script-01.sh
+script-02.sh
+script-03.sh
+script-04.sh
+
+./child-directory:
+helper-1.txt
+helper-2.txt
+helper-3.txt
diff --git a/expect/individual-shell-tools/ls/script-04.sh b/expect/individual-shell-tools/ls/script-04.sh
new file mode 100755
index 0000000..86e7570
--- /dev/null
+++ b/expect/individual-shell-tools/ls/script-04.sh
@@ -0,0 +1,8 @@
+First exercise (sorted newest to oldest):
+helper-3.txt
+helper-1.txt
+helper-2.txt
+Second exercise (sorted oldest to newest):
+helper-2.txt
+helper-1.txt
+helper-3.txt
diff --git a/expect/individual-shell-tools/sed/script-01.sh b/expect/individual-shell-tools/sed/script-01.sh
new file mode 100755
index 0000000..d92b03a
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-01.sh
@@ -0,0 +1,11 @@
+ThIs Is a sample fIle for experImentIng wIth sed.
+
+It contaIns many lInes, and there are some thIngs you may want to do wIth each of them.
+
+We'll Include some score InformatIon:
+37 AlIsha
+15 Jacob
+7 PIetro
+3 Katya
+
+We also should remember, when we go shoppIng, to get 4 Items: oranges,cheese,bread,olIves.
diff --git a/expect/individual-shell-tools/sed/script-02.sh b/expect/individual-shell-tools/sed/script-02.sh
new file mode 100755
index 0000000..e326bd4
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-02.sh
@@ -0,0 +1,11 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+ Alisha
+ Jacob
+ Pietro
+ Katya
+
+We also should remember, when we go shopping, to get  items: oranges,cheese,bread,olives.
diff --git a/expect/individual-shell-tools/sed/script-03.sh b/expect/individual-shell-tools/sed/script-03.sh
new file mode 100755
index 0000000..088b17d
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-03.sh
@@ -0,0 +1,6 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+
diff --git a/expect/individual-shell-tools/sed/script-04.sh b/expect/individual-shell-tools/sed/script-04.sh
new file mode 100755
index 0000000..852fa15
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-04.sh
@@ -0,0 +1,11 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+37 Alisha
+15 Jacob
+7 Pietro
+3 Katya
+
+We also should remember, when we go shopping, to get 4 items: oranges,cheese,bread,olives.
diff --git a/expect/individual-shell-tools/sed/script-05.sh b/expect/individual-shell-tools/sed/script-05.sh
new file mode 100755
index 0000000..fe4d9d1
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-05.sh
@@ -0,0 +1,11 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+Alisha 37
+Jacob 15
+Pietro 7
+Katya 3
+
+We also should remember, when we go shopping, to get 4 items: oranges,cheese,bread,olives.
diff --git a/expect/individual-shell-tools/sed/script-06.sh b/expect/individual-shell-tools/sed/script-06.sh
new file mode 100755
index 0000000..d9f950f
--- /dev/null
+++ b/expect/individual-shell-tools/sed/script-06.sh
@@ -0,0 +1,11 @@
+This is a sample file for experimenting with sed.
+
+It contains many lines, and there are some things you may want to do with each of them.
+
+We'll include some score information:
+37 Alisha
+15 Jacob
+7 Pietro
+3 Katya
+
+We also should remember, when we go shopping, to get 4 items: oranges, cheese, bread, olives.
diff --git a/expect/individual-shell-tools/wc/script-01.sh b/expect/individual-shell-tools/wc/script-01.sh
new file mode 100755
index 0000000..d1ad53e
--- /dev/null
+++ b/expect/individual-shell-tools/wc/script-01.sh
@@ -0,0 +1 @@
+19 ../helper-files/helper-3.txt
diff --git a/expect/individual-shell-tools/wc/script-02.sh b/expect/individual-shell-tools/wc/script-02.sh
new file mode 100755
index 0000000..6bd060b
--- /dev/null
+++ b/expect/individual-shell-tools/wc/script-02.sh
@@ -0,0 +1 @@
+3 ../helper-files/helper-3.txt
diff --git a/expect/individual-shell-tools/wc/script-03.sh b/expect/individual-shell-tools/wc/script-03.sh
new file mode 100755
index 0000000..572716a
--- /dev/null
+++ b/expect/individual-shell-tools/wc/script-03.sh
@@ -0,0 +1,4 @@
+  1   4  20 ../helper-files/helper-1.txt
+  1   7  39 ../helper-files/helper-2.txt
+  3  19  92 ../helper-files/helper-3.txt
+  5  30 151 total
diff --git a/expect/jq/script-01.sh b/expect/jq/script-01.sh
new file mode 100755
index 0000000..e16f4ed
--- /dev/null
+++ b/expect/jq/script-01.sh
@@ -0,0 +1 @@
+Selma
diff --git a/expect/jq/script-02.sh b/expect/jq/script-02.sh
new file mode 100755
index 0000000..18711af
--- /dev/null
+++ b/expect/jq/script-02.sh
@@ -0,0 +1 @@
+35 Fashion Street, London, E1 6PX
diff --git a/expect/jq/script-03.sh b/expect/jq/script-03.sh
new file mode 100755
index 0000000..d63f6ec
--- /dev/null
+++ b/expect/jq/script-03.sh
@@ -0,0 +1,2 @@
+Selma, Software Engineer
+Selma, Software Engineer
diff --git a/expect/jq/script-04.sh b/expect/jq/script-04.sh
new file mode 100755
index 0000000..050f043
--- /dev/null
+++ b/expect/jq/script-04.sh
@@ -0,0 +1,6 @@
+Ahmed
+Basia
+Mehmet
+Leila
+Piotr
+Chandra
diff --git a/expect/jq/script-05.sh b/expect/jq/script-05.sh
new file mode 100755
index 0000000..ee7e0fe
--- /dev/null
+++ b/expect/jq/script-05.sh
@@ -0,0 +1,6 @@
+Ahmed London
+Basia London
+Mehmet Birmingham
+Leila London
+Piotr Glasgow
+Chandra Birmingham
diff --git a/expect/jq/script-06.sh b/expect/jq/script-06.sh
new file mode 100755
index 0000000..f5d0b1f
--- /dev/null
+++ b/expect/jq/script-06.sh
@@ -0,0 +1,6 @@
+Ahmed 1
+Basia 22
+Mehmet 3
+Leila 1
+Piotr 15
+Chandra 12
diff --git a/expect/jq/script-07.sh b/expect/jq/script-07.sh
new file mode 100755
index 0000000..59c783f
--- /dev/null
+++ b/expect/jq/script-07.sh
@@ -0,0 +1,6 @@
+Ahmed 4
+Basia 6
+Mehmet 17
+Leila 1
+Piotr 8
+Chandra 6
diff --git a/expect/jq/script-08.sh b/expect/jq/script-08.sh
new file mode 100755
index 0000000..dd7e1d3
--- /dev/null
+++ b/expect/jq/script-08.sh
@@ -0,0 +1,6 @@
+Ahmed 3
+Basia 3
+Mehmet 3
+Leila 1
+Piotr 5
+Chandra 2
diff --git a/expect/jq/script-09.sh b/expect/jq/script-09.sh
new file mode 100755
index 0000000..33ff777
--- /dev/null
+++ b/expect/jq/script-09.sh
@@ -0,0 +1,6 @@
+Ahmed 15
+Basia 37
+Mehmet 32
+Leila 1
+Piotr 61
+Chandra 18
diff --git a/expect/jq/script-10.sh b/expect/jq/script-10.sh
new file mode 100755
index 0000000..fb1e7bc
--- /dev/null
+++ b/expect/jq/script-10.sh
@@ -0,0 +1 @@
+54
diff --git a/expect/jq/script-11.sh b/expect/jq/script-11.sh
new file mode 100755
index 0000000..4e9bdff
--- /dev/null
+++ b/expect/jq/script-11.sh
@@ -0,0 +1 @@
+164
diff --git a/expect/number-systems/Part-1.json b/expect/number-systems/Part-1.json
new file mode 100644
index 0000000..d96c538
--- /dev/null
+++ b/expect/number-systems/Part-1.json
@@ -0,0 +1 @@
+{"answers": [0, 1110, 45, 1000, "01011", 11111, 100010, 15, 8, 2, "(10$|10[^0-9])", "E", 182, 902, 11, 33]}
diff --git a/expect/shell-pipelines/ls-grep/script-01.sh b/expect/shell-pipelines/ls-grep/script-01.sh
new file mode 100755
index 0000000..5481774
--- /dev/null
+++ b/expect/shell-pipelines/ls-grep/script-01.sh
@@ -0,0 +1,11 @@
+Ariane
+Daniel
+HoChiMinh
+KualaLumpur
+Levi
+London
+NewYork
+Niamh
+Olga
+York
+dHondt
diff --git a/expect/shell-pipelines/ls-grep/script-02.sh b/expect/shell-pipelines/ls-grep/script-02.sh
new file mode 100755
index 0000000..35f2e44
--- /dev/null
+++ b/expect/shell-pipelines/ls-grep/script-02.sh
@@ -0,0 +1,10 @@
+Ariane
+Daniel
+HoChiMinh
+KualaLumpur
+Levi
+London
+NewYork
+Niamh
+Olga
+York
diff --git a/expect/shell-pipelines/ls-grep/script-03.sh b/expect/shell-pipelines/ls-grep/script-03.sh
new file mode 100755
index 0000000..37ec450
--- /dev/null
+++ b/expect/shell-pipelines/ls-grep/script-03.sh
@@ -0,0 +1,7 @@
+Ariane
+Daniel
+Levi
+London
+Niamh
+Olga
+York
diff --git a/expect/shell-pipelines/ls-grep/script-04.sh b/expect/shell-pipelines/ls-grep/script-04.sh
new file mode 100755
index 0000000..7f8f011
--- /dev/null
+++ b/expect/shell-pipelines/ls-grep/script-04.sh
@@ -0,0 +1 @@
+7
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-01.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-01.sh
new file mode 100755
index 0000000..a622bc9
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-01.sh
@@ -0,0 +1,6 @@
+Ahmed London 1 10 4
+Basia London 22 9 6
+Chandra Birmingham 12 6
+Leila London 1
+Mehmet Birmingham 3 12 17
+Piotr Glasgow 15 2 25 11 8
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-02.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-02.sh
new file mode 100755
index 0000000..c560f60
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-02.sh
@@ -0,0 +1,6 @@
+Basia London 22 9 6
+Piotr Glasgow 15 2 25 11 8
+Chandra Birmingham 12 6
+Mehmet Birmingham 3 12 17
+Leila London 1
+Ahmed London 1 10 4
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-03.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-03.sh
new file mode 100755
index 0000000..52d05bc
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-03.sh
@@ -0,0 +1,3 @@
+Basia London 22 9 6
+Piotr Glasgow 15 2 25 11 8
+Chandra Birmingham 12 6
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-04.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-04.sh
new file mode 100755
index 0000000..9c18f93
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-04.sh
@@ -0,0 +1 @@
+Piotr Glasgow 15 2 25 11 8
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-05.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-05.sh
new file mode 100755
index 0000000..5b6440e
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-05.sh
@@ -0,0 +1,6 @@
+Entry German
+Entry Mariana
+Entry Sally
+Exit German
+Exit Mariana
+Exit Sally
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-06.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-06.sh
new file mode 100755
index 0000000..93bd06b
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-06.sh
@@ -0,0 +1,2 @@
+      5 Entry
+      4 Exit
diff --git a/expect/shell-pipelines/sort-uniq-head-tail/script-07.sh b/expect/shell-pipelines/sort-uniq-head-tail/script-07.sh
new file mode 100755
index 0000000..93bd06b
--- /dev/null
+++ b/expect/shell-pipelines/sort-uniq-head-tail/script-07.sh
@@ -0,0 +1,2 @@
+      5 Entry
+      4 Exit
diff --git a/expect/shell-pipelines/tr/script-01.sh b/expect/shell-pipelines/tr/script-01.sh
new file mode 100755
index 0000000..8dea4eb
--- /dev/null
+++ b/expect/shell-pipelines/tr/script-01.sh
@@ -0,0 +1,11 @@
+Dear Yara,
+
+Mz apologies for sending this response so late. As zou know, there's been a lot going on.
+
+Unfortunatelz I don't think I'll be able to make it to Yimbabwe, but but sounds amaying.
+
+Hope zou're doing well, and enjoz the trip.
+
+Thanks,
+
+Karolina
diff --git a/expect/shell-pipelines/tr/script-02.sh b/expect/shell-pipelines/tr/script-02.sh
new file mode 100755
index 0000000..e00561a
--- /dev/null
+++ b/expect/shell-pipelines/tr/script-02.sh
@@ -0,0 +1,11 @@
+Dear Zara,
+
+My apologies for sending this response so late. As you know, there's been a lot going on!
+
+Unfortunately I don't think I'll be able to make it to Zimbabwe, but but sounds amazing!
+
+Hope you're doing well, and enjoy the trip!
+
+Thanks,
+
+Karolina
diff --git a/number-systems/Part-1.md b/number-systems/Part-1.md
new file mode 100644
index 0000000..d8f9c29
--- /dev/null
+++ b/number-systems/Part-1.md
@@ -0,0 +1,54 @@
+Do not use any tools or programming to solve these problems. Work it out yourself by hand, and fill in the answers.
+
+Do not convert any binary numbers to decimal when solving a question unless the question explicitly tells you to.
+
+The goal of these exercises is for you to gain an intuition for binary numbers. Using tools to solve the problems defeats the point.
+
+The answers to these questions should be a number, either in binary, hex, or decimal.
+
+Q1: Convert the decimal number 14 to binary.
+Answer:
+
+Q2: Convert the binary number 101101 to decimal:
+Answer:
+
+Q3: Which is larger: 1000 or 0111?
+Answer:
+
+Q4: Which is larger: 00100 or 01011?
+Answer:
+
+Q5: What is 10101 + 01010?
+Answer:
+
+Q6: What is 10001 + 10001?
+Answer:
+
+Q7: What's the largest number you can store with 4 bits, if you want to be able to represent the number 0?
+Answer:
+
+Q8: How many bits would you need in order to store the numbers between 0 and 255 inclusive?
+Answer:
+
+Q9: How many bits would you need in order to store the numbers between 0 and 3 inclusive?
+Answer:
+
+Q10: How many bits would you need in order to store the numbers between 0 and 1000 inclusive?
+Answer:
+
+Q11: Convert the decimal number 14 to hex.
+Answer:
+ 
+Q12: Convert the decimal number 386 to hex.
+Answer:
+
+Q13: Convert the hex number 386 to decimal.
+Answer:
+
+Q14: Convert the hex number B to decimal.
+Answer:
+
+Q15: If reading the byte 0x21 as a number, what decimal number would it mean?
+Answer:
+
+Q16: Continues in Part-2
diff --git a/number-systems/Part-2.md b/number-systems/Part-2.md
new file mode 100644
index 0000000..92b7005
--- /dev/null
+++ b/number-systems/Part-2.md
@@ -0,0 +1,22 @@
+Do not use any tools or programming to solve these problems. Work it out yourself by hand, and fill in the answers.
+
+Do not convert any binary numbers to decimal when solving a question unless the question explicitly tells you to.
+
+The goal of these exercises is for you to gain an intuition for binary numbers. Using tools to solve the problems defeats the point.
+
+The answers to these questions will require a bit of explanation, not just a simple answer.
+
+Q16: How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)?
+Answer: 
+
+Q17: If reading the byte 0x21 as an ASCII character, what character would it mean?
+Answer: 
+
+Q18: If reading the byte 0x21 as a greyscale colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
+Answer: 
+
+Q19: If reading the bytes 0xAA00FF as an RGB colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
+Answer: 
+
+Q20: If reading the bytes 0xAA00FF as a sequence of three one-byte decimal numbers, what decimal numbers would they be?
+Answer: 
diff --git a/number-systems/README.md b/number-systems/README.md
deleted file mode 100644
index 77a3bde..0000000
--- a/number-systems/README.md
+++ /dev/null
@@ -1,65 +0,0 @@
-Do not use any tools or programming to solve these problems. Work it out yourself by hand, and fill in the answers.
-
-Do not convert any binary numbers to decimal when solving a question unless the question explicitly tells you to.
-
-The goal of these exercises is for you to gain an intuition for binary numbers. Using tools to solve the problems defeats the point.
-
-Convert the decimal number 14 to binary.
-Answer:
-
-Convert the binary number 101101 to decimal:
-Answer:
-
-Which is larger: 1000 or 0111?
-Answer:
-
-Which is larger: 00100 or 01011?
-Answer:
-
-What is 10101 + 01010?
-Answer:
-
-What is 10001 + 10001?
-Answer:
-
-What's the largest number you can store with 4 bits, if you want to be able to represent the number 0?
-Answer:
-
-How many bits would you need in order to store the numbers between 0 and 255 inclusive?
-Answer:
-
-How many bits would you need in order to store the numbers between 0 and 3 inclusive?
-Answer:
-
-How many bits would you need in order to store the numbers between 0 and 1000 inclusive?
-Answer:
-
-How can you test if a binary number is a power of two (e.g. 1, 2, 4, 8, 16, ...)?
-Answer:
-
-Convert the decimal number 14 to hex.
-Answer:
-
-Convert the decimal number 386 to hex.
-Answer:
-
-Convert the hex number 386 to decimal.
-Answer:
-
-Convert the hex number B to decimal.
-Answer:
-
-If reading the byte 0x21 as a number, what decimal number would it mean?
-Answer:
-
-If reading the byte 0x21 as an ASCII character, what character would it mean?
-Answer:
-
-If reading the byte 0x21 as a greyscale colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer:
-
-If reading the bytes 0xAA00FF as an RGB colour, as described in "Approaches for Representing Colors and Images", what colour would it mean?
-Answer:
-
-If reading the bytes 0xAA00FF as a sequence of three one-byte decimal numbers, what decimal numbers would they be?
-Answer:
diff --git a/test-sdc.sh b/test-sdc.sh
new file mode 100755
index 0000000..b8f32cf
--- /dev/null
+++ b/test-sdc.sh
@@ -0,0 +1,132 @@
+# This test file will be automatically run when you submit a pull request
+# You should not modify this file
+# You can run this file using ./test-sdc.sh task-directory-name to check your output
+
+echo "<!--CYFTT tag: sdc-test-results-->" > testoutput.txt
+echo "Results of test" >> testoutput.txt
+
+if [[ "$1" == "individual-shell-tools" ]]; then
+	cd individual-shell-tools
+	pass=0
+	total=0
+	for directory in */; do
+		cd $directory
+		if [ "$directory" == "helper-files/" ]; then
+			cd ..
+			continue
+		fi
+		for exercise in *.sh; do
+			total=$(($total+1))
+			./$exercise > ../../test.tmp
+			cmp ../../test.tmp ../../expect/individual-shell-tools/$directory$exercise --quiet
+			if [ $? -eq 0 ]; then
+				pass=$(($pass+1))
+			else
+				if [[ "$exercise" == *"stretch"* && $(stat -c%s ../../test.tmp) == "0" ]]; then
+					# Stretch task not attempted, ignoring"
+					total=$(($total-1))
+				else
+					echo "Failed $directory$exercise, please check" >> ../../testoutput.txt
+				fi
+			fi
+		done
+		cd ..
+	done
+	cd ..
+	rm test.tmp
+	echo "You passed $pass/$total tasks." >> testoutput.txt
+	if [ -v GITHUB_OUTPUT ]; then
+		echo "attempted=y" >> "$GITHUB_OUTPUT"
+	fi
+	if [ $pass -ge $total ]; then
+		echo "This task is complete!" >> testoutput.txt
+		if [ -v GITHUB_OUTPUT ]; then
+			echo "complete=y" >> "$GITHUB_OUTPUT"
+		fi
+	fi
+	cat testoutput.txt
+elif [[ "$1" == "shell-pipelines" ]]; then
+	cd shell-pipelines
+	pass=0
+	total=0
+	for directory in */; do
+		cd $directory
+		for exercise in *.sh; do
+			total=$(($total+1))
+			./$exercise > ../../test.tmp
+			cmp ../../test.tmp ../../expect/shell-pipelines/$directory$exercise --quiet
+			if [ $? -eq 0 ]; then
+				pass=$(($pass+1))
+			else
+				echo "Failed $directory$exercise, please check" >> ../../testoutput.txt
+			fi
+		done
+		cd ..
+	done
+	cd ..
+	rm test.tmp
+	echo "You passed $pass/$total tasks." >> testoutput.txt
+	if [ -v GITHUB_OUTPUT ]; then
+		echo "attempted=y" >> "$GITHUB_OUTPUT"
+	fi
+	if [ $pass -eq $total ]; then
+		echo "This task is complete!" >> testoutput.txt
+		if [ -v GITHUB_OUTPUT ]; then
+			echo "complete=y" >> "$GITHUB_OUTPUT"
+		fi
+	fi
+	cat testoutput.txt
+elif [[ "$1" == "jq" ]]; then
+	cd jq
+	pass=0
+	total=0
+	for exercise in *.sh; do
+		total=$(($total+1))
+		./$exercise > ../test.tmp
+		cmp ../test.tmp ../expect/jq/$exercise --quiet
+		if [ $? -eq 0 ]; then
+			pass=$(($pass+1))
+		else
+			echo "Failed $exercise, please check" >> ../testoutput.txt
+		fi
+	done
+	cd ..
+	rm test.tmp
+	echo "You passed $pass/$total tasks." >> testoutput.txt
+	if [ -v GITHUB_OUTPUT ]; then
+		echo "attempted=y" >> "$GITHUB_OUTPUT"
+	fi
+	if [ $pass -eq $total ]; then
+		echo "This task is complete!" >> testoutput.txt
+		if [ -v GITHUB_OUTPUT ]; then
+			echo "complete=y" >> "$GITHUB_OUTPUT"
+		fi
+	fi
+	cat testoutput.txt
+elif [[ "$1" == "number-systems" ]]; then
+	pass=0
+	for question in $(seq 1 15); do
+		answer=$(jq -r ".answers[$question]" expect/number-systems/Part-1.json)
+		nextq=$(($question+1))
+		Q_START=$(grep -n "Q$question:" number-systems/Part-1.md | cut -d: -f1)
+		ANS_START=$(($Q_START + 1))
+		NEXT_Q_START=$(grep -n "Q$nextq:" number-systems/Part-1.md | cut -d: -f1)
+		ANS_END=$(($NEXT_Q_START - 1))
+		sed -n "$ANS_START,${ANS_END}p;${NEXT_Q_START}q" number-systems/Part-1.md | cut -d: -f2- > answerfile
+		grep --quiet -iE $answer answerfile
+		if [ $? -eq 0 ]; then
+			pass=$(($pass+1))
+		else
+			echo "Q$question incorrect, please check" >> testoutput.txt
+		fi
+		rm answerfile
+	done
+	echo "You passed $pass/15 tasks in part 1." >> testoutput.txt
+	if [ -v GITHUB_OUTPUT ]; then
+		echo "attempted=y" >> "$GITHUB_OUTPUT"
+	fi
+	echo "Please let a volunteer check the answers for part 2." >> testoutput.txt
+	cat testoutput.txt
+else
+	echo "Please run this with a valid test directory name as argument"
+fi

From f38fee54def1961f51947ca50ef9dde930a00c39 Mon Sep 17 00:00:00 2001
From: Daniel Wagner-Hall <daniel@codeyourfuture.io>
Date: Tue, 12 May 2026 14:26:50 +0100
Subject: [PATCH 03/15] Make test-sdc script more portable (#520)

* Add a shebang because `-v` is a bash-ism not present in whatever my
default shell is on macOS.
* Remove `--quiet` from `cmp` - macOS's `cmp` doesn't support it.
---
 test-sdc.sh | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/test-sdc.sh b/test-sdc.sh
index b8f32cf..acf9897 100755
--- a/test-sdc.sh
+++ b/test-sdc.sh
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # This test file will be automatically run when you submit a pull request
 # You should not modify this file
 # You can run this file using ./test-sdc.sh task-directory-name to check your output
@@ -18,7 +20,7 @@ if [[ "$1" == "individual-shell-tools" ]]; then
 		for exercise in *.sh; do
 			total=$(($total+1))
 			./$exercise > ../../test.tmp
-			cmp ../../test.tmp ../../expect/individual-shell-tools/$directory$exercise --quiet
+			cmp ../../test.tmp ../../expect/individual-shell-tools/$directory$exercise
 			if [ $? -eq 0 ]; then
 				pass=$(($pass+1))
 			else
@@ -54,7 +56,7 @@ elif [[ "$1" == "shell-pipelines" ]]; then
 		for exercise in *.sh; do
 			total=$(($total+1))
 			./$exercise > ../../test.tmp
-			cmp ../../test.tmp ../../expect/shell-pipelines/$directory$exercise --quiet
+			cmp ../../test.tmp ../../expect/shell-pipelines/$directory$exercise
 			if [ $? -eq 0 ]; then
 				pass=$(($pass+1))
 			else
@@ -83,7 +85,7 @@ elif [[ "$1" == "jq" ]]; then
 	for exercise in *.sh; do
 		total=$(($total+1))
 		./$exercise > ../test.tmp
-		cmp ../test.tmp ../expect/jq/$exercise --quiet
+		cmp ../test.tmp ../expect/jq/$exercise
 		if [ $? -eq 0 ]; then
 			pass=$(($pass+1))
 		else

From ab33fa5254177acf1df97d1557f5f87ef9a5eeeb Mon Sep 17 00:00:00 2001
From: Daniel Wagner-Hall <daniel@codeyourfuture.io>
Date: Tue, 12 May 2026 15:26:14 +0100
Subject: [PATCH 04/15] Add automated tests for cowsay implementation (#521)

---
 .github/workflows/validate-pr-metadata.yml | 11 +++--
 expect/implement-cowsay/cow-grass.txt      | 10 +++++
 expect/implement-cowsay/turtle-fish.txt    | 22 ++++++++++
 test-sdc.sh                                | 47 ++++++++++++++++++++++
 4 files changed, 87 insertions(+), 3 deletions(-)
 create mode 100644 expect/implement-cowsay/cow-grass.txt
 create mode 100644 expect/implement-cowsay/turtle-fish.txt

diff --git a/.github/workflows/validate-pr-metadata.yml b/.github/workflows/validate-pr-metadata.yml
index 8ff276f..b4ff602 100644
--- a/.github/workflows/validate-pr-metadata.yml
+++ b/.github/workflows/validate-pr-metadata.yml
@@ -48,15 +48,20 @@ jobs:
         if: contains(steps.changed-files.outputs.modified_files, 'number-systems/')
         run: ./test-sdc.sh number-systems
         shell: bash
+      - name: test implement-cowsay
+        id: test-implement-cowsay
+        if: contains(steps.changed-files.outputs.modified_files, 'implement-cowsay/')
+        run: ./test-sdc.sh implement-cowsay
+        shell: bash
       - name: make output comment
-        if: steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y' || steps.test-number-systems.outputs.attempted == 'y'
+        if: steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y' || steps.test-number-systems.outputs.attempted == 'y' || steps.test-implement-cowsay.outputs.attempted == 'y'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ISSUE_URL: ${{ github.event.pull_request.html_url }}
         run: |
           gh pr comment $ISSUE_URL --body-file testoutput.txt
       - name: add appropriate labels
-        if: steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y'
+        if: steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y' || steps.test-implement-cowsay.outputs.complete == 'y'
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ISSUE_URL: ${{ github.event.pull_request.html_url }}
@@ -64,6 +69,6 @@ jobs:
           gh pr edit $ISSUE_URL --add-label "Complete"
           gh pr edit $ISSUE_URL --remove-label "Needs Review"
       - name: fail if not complete
-        if: (steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y') && !(steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y')
+        if: (steps.test-individual-shell-tools.outputs.attempted == 'y' || steps.test-jq.outputs.attempted == 'y' || steps.test-shell-pipelines.outputs.attempted == 'y' || steps.test-implement-cowsay.outputs.attempted == 'y') && !(steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y' || steps.test-implement-cowsay.outputs.complete == 'y')
         run: |
           exit -1
diff --git a/expect/implement-cowsay/cow-grass.txt b/expect/implement-cowsay/cow-grass.txt
new file mode 100644
index 0000000..d9c665a
--- /dev/null
+++ b/expect/implement-cowsay/cow-grass.txt
@@ -0,0 +1,10 @@
+  ________________
+| Grass, delicious |
+  ================
+                \
+                 \
+                   ^__^
+                   (oo)\_______
+                   (__)\       )\/\
+                       ||----w |
+                       ||     ||
diff --git a/expect/implement-cowsay/turtle-fish.txt b/expect/implement-cowsay/turtle-fish.txt
new file mode 100644
index 0000000..5dadfa0
--- /dev/null
+++ b/expect/implement-cowsay/turtle-fish.txt
@@ -0,0 +1,22 @@
+  ______________
+| Fish are cool! |
+  ==============
+                \
+                 \
+                  \
+                   \
+                                              ___-------___
+                                          _-~~             ~~-_
+                                       _-~                    /~-_
+                     /^\__/^\         /~  \                   /    \
+                   /|  O|| O|        /      \_______________/        \
+                  | |___||__|      /       /                \          \
+                  |          \    /      /                    \          \
+                  |   (_______) /______/                        \_________ \
+                  |         / /         \                      /            \
+                   \         \^\\         \                  /               \     /
+                     \         ||           \______________/      _-_       //\__//
+                       \       ||------_-~~-_ ------------- \ --/~   ~\    || __/
+                         ~-----||====/~     |==================|       |/~~~~~
+                          (_(__/  ./     /                    \_\      \.
+                                 (_(___/                         \_____)_)
diff --git a/test-sdc.sh b/test-sdc.sh
index acf9897..adc8dc4 100755
--- a/test-sdc.sh
+++ b/test-sdc.sh
@@ -129,6 +129,53 @@ elif [[ "$1" == "number-systems" ]]; then
 	fi
 	echo "Please let a volunteer check the answers for part 2." >> testoutput.txt
 	cat testoutput.txt
+elif [[ "$1" == "implement-cowsay" ]]; then
+  if [ -v GITHUB_OUTPUT ]; then
+    echo "attempted=y" >> "$GITHUB_OUTPUT"
+  fi
+  if [[ -e .cowsay-venv ]]; then
+    echo ".cowsay-venv already exists - couldn't test cowsay" >> testoutput.txt
+  else
+    if [ ! -e implement-cowsay/requirements.txt ]; then
+      echo "Expected implement-cowsay/requirements.txt to exist but it didn't" >> testoutput.txt
+    else
+      python3 -m venv .cowsay-venv
+      . .cowsay-venv/bin/activate
+      pip3 install -r implement-cowsay/requirements.txt
+
+      all_ok=true
+
+      python3 implement-cowsay/cow.py Grass, delicious > test.tmp
+      cmp test.tmp expect/implement-cowsay/cow-grass.txt
+      if [ $? -ne 0 ]; then
+        echo "Unexpected cowsay output for Grass, delicious" >> testoutput.txt
+        all_ok=false
+      fi
+
+      python3 implement-cowsay/cow.py --animal turtle "Fish are cool!" > test.tmp
+      cmp test.tmp expect/implement-cowsay/turtle-fish.txt
+      if [ $? -ne 0 ]; then
+        echo "Unexpected cowsay output for Fish are cool!" >> testoutput.txt
+        all_ok=false
+      fi
+
+      python3 implement-cowsay/cow.py --help | grep dragon
+      if [ $? -ne 0 ]; then
+        echo "Expected python3 cow.py --help to include dragon as it's one of the animal options" >> testoutput.txt
+        all_ok=false
+      fi
+
+      grep dragon implement-cowsay/cow.py > /dev/null
+      if [ $? -eq 0 ]; then
+        echo "Didn't expect cow.py to include the word dragon - you should pull in the animal options from the library not write them yourself" >> testoutput.txt
+        all_ok=false
+      fi
+
+      if [[ "${all_ok}" == "true" && -v GITHUB_OUTPUT ]]; then
+        echo "completed=y" >> "$GITHUB_OUTPUT"
+      fi
+    fi
+  fi
 else
 	echo "Please run this with a valid test directory name as argument"
 fi

From d3857c25cc7a1a94111183aa2901ef73c45c4865 Mon Sep 17 00:00:00 2001
From: Daniel Wagner-Hall <daniel@codeyourfuture.io>
Date: Wed, 13 May 2026 10:05:37 +0100
Subject: [PATCH 05/15] Improve cowsay comments (#522)

* Trigger on added files - Cowsay involves writing brand new files
* Hide previous comments
* Fix completed -> complete
* Clean up output a little
---
 .github/workflows/validate-pr-metadata.yml | 4 +++-
 test-sdc.sh                                | 9 +++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/.github/workflows/validate-pr-metadata.yml b/.github/workflows/validate-pr-metadata.yml
index b4ff602..6fa2e1d 100644
--- a/.github/workflows/validate-pr-metadata.yml
+++ b/.github/workflows/validate-pr-metadata.yml
@@ -50,7 +50,7 @@ jobs:
         shell: bash
       - name: test implement-cowsay
         id: test-implement-cowsay
-        if: contains(steps.changed-files.outputs.modified_files, 'implement-cowsay/')
+        if: contains(steps.changed-files.outputs.all_modified_files, 'implement-cowsay/')
         run: ./test-sdc.sh implement-cowsay
         shell: bash
       - name: make output comment
@@ -59,6 +59,8 @@ jobs:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           ISSUE_URL: ${{ github.event.pull_request.html_url }}
         run: |
+          gh release -R CodeYourFuture/trainee-tracker view --json assets -q ".assets[] | select(.name | startswith(\"pr-metadata-validator-musl-\")).url" | xargs curl --fail -L -o /tmp/pr-metadata-validator && chmod 0755 /tmp/pr-metadata-validator
+          /tmp/pr-metadata-validator --only-close-existing-comments-with-tag="sdc-test-results" "${ISSUE_URL}"
           gh pr comment $ISSUE_URL --body-file testoutput.txt
       - name: add appropriate labels
         if: steps.test-individual-shell-tools.outputs.complete == 'y' || steps.test-jq.outputs.complete == 'y' || steps.test-shell-pipelines.outputs.complete == 'y' || steps.test-implement-cowsay.outputs.complete == 'y'
diff --git a/test-sdc.sh b/test-sdc.sh
index adc8dc4..62d1c7e 100755
--- a/test-sdc.sh
+++ b/test-sdc.sh
@@ -5,7 +5,7 @@
 # You can run this file using ./test-sdc.sh task-directory-name to check your output
 
 echo "<!--CYFTT tag: sdc-test-results-->" > testoutput.txt
-echo "Results of test" >> testoutput.txt
+echo "Results of test:" >> testoutput.txt
 
 if [[ "$1" == "individual-shell-tools" ]]; then
 	cd individual-shell-tools
@@ -148,14 +148,14 @@ elif [[ "$1" == "implement-cowsay" ]]; then
       python3 implement-cowsay/cow.py Grass, delicious > test.tmp
       cmp test.tmp expect/implement-cowsay/cow-grass.txt
       if [ $? -ne 0 ]; then
-        echo "Unexpected cowsay output for Grass, delicious" >> testoutput.txt
+        echo "Unexpected cowsay output for 'Grass, delicious'." >> testoutput.txt
         all_ok=false
       fi
 
       python3 implement-cowsay/cow.py --animal turtle "Fish are cool!" > test.tmp
       cmp test.tmp expect/implement-cowsay/turtle-fish.txt
       if [ $? -ne 0 ]; then
-        echo "Unexpected cowsay output for Fish are cool!" >> testoutput.txt
+        echo "Unexpected cowsay output for --animal turtle Fish are cool!" >> testoutput.txt
         all_ok=false
       fi
 
@@ -172,7 +172,8 @@ elif [[ "$1" == "implement-cowsay" ]]; then
       fi
 
       if [[ "${all_ok}" == "true" && -v GITHUB_OUTPUT ]]; then
-        echo "completed=y" >> "$GITHUB_OUTPUT"
+        echo "complete=y" >> "$GITHUB_OUTPUT"
+        echo "Your implementation passed all checks." >> testoutput.txt
       fi
     fi
   fi

From 6c16e453f63e49b558e61af6b8cc3753b4157bb4 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Fri, 29 May 2026 21:15:27 +0100
Subject: [PATCH 06/15] Step 1: Why we use types

---
 sprint-5-prep/1-use-types.py | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 sprint-5-prep/1-use-types.py

diff --git a/sprint-5-prep/1-use-types.py b/sprint-5-prep/1-use-types.py
new file mode 100644
index 0000000..28d3014
--- /dev/null
+++ b/sprint-5-prep/1-use-types.py
@@ -0,0 +1,50 @@
+# Exercise-1
+
+# Predict what double("22") will do. 
+# Then run the code and check. Did it do what you expected? 
+# Why did it return the value it did?
+
+def double(value):
+    return value * 2
+
+#Answer
+#I guess it'll return 2222. That's because any value in quotes is a string, 
+# and when strings are multiplied, they repeat the characters.
+
+def double(value):
+    return value * 2
+
+print("double is:", double("22"))   #double is: 2222
+
+# Yes, It returned 2222 as I predicted.
+# Python's operator "*" when used with a string and a number, repeats this string as "number" times,
+# and it didn't convert the string "22" into number 22.
+
+
+#Exercise-2
+
+def double(number):
+    return number * 3
+
+print(double(10))
+
+
+#Read the above code and write down what the bug is. How would you fix it?
+
+# Answer
+# There are two way to fix it:
+# 1. Change *3 to *2.
+
+def double(number):
+    return number * 2
+
+print(double(10))
+
+# or
+
+# 2. Rename the function to "triple" if we want multiply by 3 - it keeps the logic correct.
+
+def triple(number):
+    return number * 3
+
+print(triple(10))

From b5c1ee63d002324b394d4b18470448a62aeb67ea Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Fri, 29 May 2026 21:16:03 +0100
Subject: [PATCH 07/15] Completed task 2-type checking with mypy

---
 sprint-5-prep/2-type-checking-mypy.py | 31 +++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 sprint-5-prep/2-type-checking-mypy.py

diff --git a/sprint-5-prep/2-type-checking-mypy.py b/sprint-5-prep/2-type-checking-mypy.py
new file mode 100644
index 0000000..4d4cc1b
--- /dev/null
+++ b/sprint-5-prep/2-type-checking-mypy.py
@@ -0,0 +1,31 @@
+from typing import Dict
+
+def open_account(balances: Dict[str, int], name: str, amount: int)-> None:
+    balances[name] = amount
+
+def sum_balances(accounts: Dict[str, int])-> int:
+    total = 0
+    for name, pence in accounts.items():
+        print(f"{name} had balance {pence}")
+        total += pence
+    return total
+
+def format_pence_as_string(total_pence: int)-> str:
+    if total_pence < 100:
+        return f"{total_pence}p"
+    pounds = int(total_pence / 100)
+    pence = total_pence % 100
+    return f"£{pounds}.{pence:02d}"
+
+balances = {
+    "Sima": 700,
+    "Linn": 545,
+    "Georg": 831,
+}
+
+open_account(balances, "Tobi", 913)
+open_account(balances, "Olya", 713)
+
+total_pence = sum_balances(balances)
+
+print(f"The bank accounts total {total_string}")
\ No newline at end of file

From a5f9233b34067c52e082ed9836c5b93c474a22a1 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Fri, 29 May 2026 21:25:02 +0100
Subject: [PATCH 08/15] Add .venv, __pycache__, .mypy_cache to .gitignore

---
 .gitignore | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.gitignore b/.gitignore
index c4234ab..63db17d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,5 @@
 node_modules
 testoutput.txt
+.venv
+__pycache__
+.mypy_cache
\ No newline at end of file

From be0ac7609236a8f563c47a134a094969eb2ed3e7 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Fri, 29 May 2026 23:12:52 +0100
Subject: [PATCH 09/15] Complete task-3 Classes and objects

---
 sprint-5-prep/3-classes-and-objects.py | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 sprint-5-prep/3-classes-and-objects.py

diff --git a/sprint-5-prep/3-classes-and-objects.py b/sprint-5-prep/3-classes-and-objects.py
new file mode 100644
index 0000000..2613ea1
--- /dev/null
+++ b/sprint-5-prep/3-classes-and-objects.py
@@ -0,0 +1,24 @@
+class Person:
+    def __init__(self, name: str, age: int, preferred_operating_system: str):
+        self.name = name
+        self.age = age
+        self.preferred_operating_system = preferred_operating_system
+
+imran = Person("Imran", 22, "Ubuntu")
+print(imran.name)
+#print(imran.address)
+#error: Person class has no attribute "address"
+
+eliza = Person("Eliza", 34, "Arch Linux")
+print(eliza.name)
+#print(eliza.address)
+#the same error: Person class has no attribute "address"
+
+def is_adult(person: Person) -> bool:
+    return person.age >= 18
+
+print(is_adult(imran))
+
+def get_phone(person: Person) -> str:
+    return person.phone_number
+# After running mypy this method also causes an error, because Person class has no attribute "phone_number"
\ No newline at end of file

From bf737b7188327ce3328c6c56746cd2bd044ed1f3 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sat, 30 May 2026 17:19:39 +0100
Subject: [PATCH 10/15] Complete task-4 Methods

---
 sprint-5-prep/4-methods.py | 44 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 sprint-5-prep/4-methods.py

diff --git a/sprint-5-prep/4-methods.py b/sprint-5-prep/4-methods.py
new file mode 100644
index 0000000..b442f30
--- /dev/null
+++ b/sprint-5-prep/4-methods.py
@@ -0,0 +1,44 @@
+# Exercises-1
+# Think of the advantages of using methods instead of free functions. 
+# Write them down in your notebook.
+
+# 1. Organisation: all Person-related logic lives inside the Person class.
+
+# 2. Encapsulation: we only have to update the method once, 
+# for example if we change "age" to "date_of_birth" inside the class.
+# With free functions, we'd have to update every function that touches person.age across the whole codebase.
+
+# 3. Simple search: if we type "imran." our editor shows everything Person can do.
+# With free functions, we have to remember they exist.
+
+# 4. Clear ownership: "person.is_adult()" is definitely about a person,
+# but with "is_adult(x)" we don't know what it's about.
+
+# 5. Easier to catch errors with mypy, because all methods related to the class are in one place.
+
+
+# Exercises-2
+# Change the Person class to take a date of birth (using the standard library’s datetime.date class)
+#  and store it in a field instead of age.
+#
+# Update the is_adult method to act the same as before.
+
+from datetime import date
+
+class Person:
+    def __init__(self, name: str, date_of_birth: date, preferred_operating_system: str):
+        self.name = name
+        self.date_of_birth = date_of_birth
+        self.preferred_operating_system = preferred_operating_system
+
+    def is_adult(self) -> bool:
+        today = date.today()
+        age = today.year - self.date_of_birth.year
+
+        if(today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day):
+            age -= 1
+
+        return age >= 18
+
+imran = Person("Imran", date(2003, 6, 20), "Ubuntu")
+print(imran.is_adult())

From 27eb06f7eab355085b7f0876a6be395e502d698e Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sun, 31 May 2026 14:26:02 +0100
Subject: [PATCH 11/15] Complete task-5 Dataclasses

---
 sprint-5-prep/5-dataclasses.py | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 sprint-5-prep/5-dataclasses.py

diff --git a/sprint-5-prep/5-dataclasses.py b/sprint-5-prep/5-dataclasses.py
new file mode 100644
index 0000000..9ebbb12
--- /dev/null
+++ b/sprint-5-prep/5-dataclasses.py
@@ -0,0 +1,22 @@
+from dataclasses import dataclass
+from datetime import date
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    date_of_birth: date
+    preferred_operating_system: str
+
+    def is_adult(self) -> bool:
+        today = date.today()
+
+        age = today.year - self.date_of_birth.year
+        if (today.month, today.day) < (self.date_of_birth.month, self.date_of_birth.day):
+            age -= 1
+        return age >= 18
+    
+
+zoi = Person("Zoi", date(2003, 3, 23), "Ubuntu")
+
+print("zoi:", zoi)
+print("zoi.is_adult():", zoi.is_adult())
\ No newline at end of file

From 8654138627c6c44734b83c0ef59b68c7336cdffe Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sun, 31 May 2026 14:45:51 +0100
Subject: [PATCH 12/15] Complete task-6 Generics

---
 sprint-5-prep/6-generics.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 sprint-5-prep/6-generics.py

diff --git a/sprint-5-prep/6-generics.py b/sprint-5-prep/6-generics.py
new file mode 100644
index 0000000..8bbece5
--- /dev/null
+++ b/sprint-5-prep/6-generics.py
@@ -0,0 +1,20 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    children: list["Person"]
+    age: int
+
+fatma = Person(name="Fatma", age=9, children=[])
+aisha = Person(name="Aisha", age=5, children=[])
+
+imran = Person(name="Imran", age=35, children=[fatma, aisha])
+
+def print_family_tree(person: Person) -> None:
+    print(person.name)
+    for child in person.children:
+        print(f"- {child.name} ({child.age})")
+
+print_family_tree(imran)
\ No newline at end of file

From a4c9cf309b9eddb3b2fe377d70a3c5a64955bea9 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sun, 31 May 2026 15:05:43 +0100
Subject: [PATCH 13/15] Complete task-7 Type-guided refactorings

---
 sprint-5-prep/7-type-guided-refactorings.py | 42 +++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 sprint-5-prep/7-type-guided-refactorings.py

diff --git a/sprint-5-prep/7-type-guided-refactorings.py b/sprint-5-prep/7-type-guided-refactorings.py
new file mode 100644
index 0000000..1d098e4
--- /dev/null
+++ b/sprint-5-prep/7-type-guided-refactorings.py
@@ -0,0 +1,42 @@
+from dataclasses import dataclass
+from typing import List
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_systems: List[str]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: str
+
+
+def find_possible_laptops(laptops: List[Laptop], person: Person) -> List[Laptop]:
+    possible_laptops = []
+    for laptop in laptops:
+        if laptop.operating_system in person.preferred_operating_systems:
+            possible_laptops.append(laptop)
+    return possible_laptops
+
+
+people = [
+    Person(name="Imran", age=22, preferred_operating_systems=["Ubuntu"]),
+    Person(name="Eliza", age=34, preferred_operating_systems=["Arch Linux"]),
+]
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system="Arch Linux"),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="Ubuntu"),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system="ubuntu"),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system="macOS"),
+]
+
+for person in people:
+    possible_laptops = find_possible_laptops(laptops, person)
+    print(f"Possible laptops for {person.name}: {possible_laptops}")
\ No newline at end of file

From 49db0115937a308a43d70614202c4f165d02e887 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sun, 31 May 2026 22:37:09 +0100
Subject: [PATCH 14/15] Complete task-8 Enums

---
 sprint-5-prep/8-enums.py | 79 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 sprint-5-prep/8-enums.py

diff --git a/sprint-5-prep/8-enums.py b/sprint-5-prep/8-enums.py
new file mode 100644
index 0000000..7b666ef
--- /dev/null
+++ b/sprint-5-prep/8-enums.py
@@ -0,0 +1,79 @@
+from dataclasses import dataclass
+from enum import Enum
+from typing import List
+import sys
+
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    ARCH = "Arch Linux"
+    UBUNTU = "Ubuntu"
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: OperatingSystem
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+os_input_name = input("Your name is: ")
+
+os_input_age = input("Your age is: ")
+try:
+    age = int(os_input_age)
+except ValueError:
+    print(f"Error: '{os_input_age}' is not a valid age", file=sys.stderr)
+    sys.exit(1)
+
+os_input_preferred_os = input("Preferred operating system is: ")
+try:
+    preferred_operating_system = OperatingSystem(os_input_preferred_os)
+except ValueError:
+    print(f"Error: '{os_input_preferred_os}' is not a valid operating system", file=sys.stderr)
+    sys.exit(1)
+
+person = Person(name = os_input_name, age=age, preferred_operating_system=preferred_operating_system)
+
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=3, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=4, manufacturer="Apple", model="macBook", screen_size_in_inches=13, operating_system=OperatingSystem.MACOS),
+    Laptop(id=5, manufacturer="Apple", model="macBook", screen_size_in_inches=14, operating_system=OperatingSystem.MACOS),
+    Laptop(id=6, manufacturer="Apple", model="macBook", screen_size_in_inches=15, operating_system=OperatingSystem.MACOS),
+]
+
+def find_specific_os(laptops: List[Laptop], preferred_os: OperatingSystem) -> List[Laptop]:
+    possible_laptops = []
+
+    for laptop in laptops:
+        if (laptop.operating_system == preferred_os):
+            possible_laptops.append(laptop)
+    
+    possible_laptops_amount = len(possible_laptops)
+
+    print(f"The amount of possible laptops with preferred operating system is", possible_laptops_amount)
+
+    return possible_laptops
+
+result = find_specific_os(laptops, preferred_operating_system)
+
+counts_laptop_per_os: dict[OperatingSystem, int] = {}
+
+for laptop in laptops:
+    os = laptop.operating_system
+    if os in counts_laptop_per_os:
+        counts_laptop_per_os[os] += 1
+    else:
+        counts_laptop_per_os[os] = 1
+
+top_os = max(counts_laptop_per_os, key=lambda os: counts_laptop_per_os[os])
+
+if top_os != preferred_operating_system:
+    print(f"If you're willing to use {top_os.value}, you're more likely to get a laptop ({counts_laptop_per_os[top_os]} available)")
\ No newline at end of file

From 7343b299ba19f3291fdcdc0db418ec5f09f37755 Mon Sep 17 00:00:00 2001
From: Konvaly <konvaly@gmail.com>
Date: Sun, 31 May 2026 22:59:05 +0100
Subject: [PATCH 15/15] Complete task-9 Inheritance

---
 sprint-5-prep/9-inheritance.py | 67 ++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 sprint-5-prep/9-inheritance.py

diff --git a/sprint-5-prep/9-inheritance.py b/sprint-5-prep/9-inheritance.py
new file mode 100644
index 0000000..af08fd1
--- /dev/null
+++ b/sprint-5-prep/9-inheritance.py
@@ -0,0 +1,67 @@
+class Parent:
+    def __init__(self, first_name: str, last_name: str):
+        self.first_name = first_name
+        self.last_name = last_name
+
+    def get_name(self) -> str:
+        return f"{self.first_name} {self.last_name}"
+
+
+class Child(Parent):
+    def __init__(self, first_name: str, last_name: str):
+        super().__init__(first_name, last_name)
+        self.previous_last_names = []
+
+    def change_last_name(self, last_name) -> None:
+        self.previous_last_names.append(self.last_name)
+        self.last_name = last_name
+
+    def get_full_name(self) -> str:
+        suffix = ""
+        if len(self.previous_last_names) > 0:
+            suffix = f" (née {self.previous_last_names[0]})"
+        return f"{self.first_name} {self.last_name}{suffix}"
+
+
+# --- Predictions ---
+
+person1 = Child("Elizaveta", "Alekseeva")
+
+print(person1.get_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: Child inherits get_name() from Parent, no name change yet
+
+print(person1.get_full_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: no previous last names, so suffix is empty string
+
+person1.change_last_name("Tyurina")
+# Saves "Alekseeva" into previous_last_names list, changes last_name to "Tyurina"
+
+print(person1.get_name())
+# Prediction: "Elizaveta Tyurina"
+# Reason: get_name() uses self.last_name which is now "Tyurina"
+
+print(person1.get_full_name())
+# Prediction: "Elizaveta Tyurina (nee Alekseeva)"
+# Reason: previous_last_names is not empty, so suffix shows the original last name
+
+person2 = Parent("Elizaveta", "Alekseeva")
+
+print(person2.get_name())
+# Prediction: "Elizaveta Alekseeva"
+# Reason: Parent has get_name(), works normally
+
+# print(person2.get_full_name())
+# Prediction: ERROR - AttributeError
+# Reason: Parent class does not have get_full_name() method, only Child does
+
+# person2.change_last_name("Tyurina")
+# Prediction: ERROR - AttributeError
+# Reason: Parent class does not have change_last_name() method, only Child does
+
+# print(person2.get_name())
+# Would print "Elizaveta Alekseeva" but we can't reach this line because of the error above
+
+# print(person2.get_full_name())
+# Would also error - Parent still doesn't have get_full_name()
\ No newline at end of file