NW | 2026-mar-sdc | Zabihollah Namazi | Sprint 4 | implement shell tools with python

.gitignore

@@ -1 +1,4 @@
 node_modules
+.venv/
+__pycache__/
+*.pyc

implement-shell-tools/cat/cat.py

@@ -0,0 +1,48 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat shell tool",
+    description="making cat tool with oython"
+)
+
+parser.add_argument(
+    "files",
+    nargs="+",
+    help="file to read"
+)
+
+parser.add_argument(
+    "-n",
+    "--number",
+    action="store_true",
+    help="add number to the lines"
+)
+
+parser.add_argument(
+    "-b",
+    "--number_nonblank",
+    action="store_true",
+    help="does not number the blank lines"
+)
+
+args = parser.parse_args()
+
+number_line = 0
+for file in args.files:
+    with open(file, "r") as f:
+        lines = f.readlines()
+
+    for line in lines:
+        if args.number_nonblank:
+            if line.strip():
+                number_line += 1
+                print(f"{number_line} {line}", end="")
+        elif args.number:
+            number_line += 1
+            print(f"{number_line} {line}", end="")
+        else:
+            print(line)
+
+
+
+

implement-shell-tools/cat/requirements.txt

@@ -0,0 +1 @@
+

implement-shell-tools/ls/ls.py

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+import argparse 
+import os
+
+parser = argparse.ArgumentParser(
+    prog="ls shell tool",
+    description="making ls tool with python"
+)
+
+parser.add_argument(
+    "-1",
+    dest="one_per_line",
+    action="store_true",
+    help="lists one per line"
+)
+parser.add_argument(
+    "-a",
+    dest="show_hidden",
+    action="store_true",
+    help="show files even hidden files"
+)
+parser.add_argument(
+    "items",
+    nargs="*", #defualt to current directory
+    help="items to list"
+)
+
+args = parser.parse_args()
+
+paths = args.items if args.items else ['.']
+
+for path in paths:
+    try:
+        entries = os.listdir(path)
+        if not args.show_hidden:
+            entries = [e for e in entries if not e.startswith(".")]
+        if args.one_per_line:
+            for entry in entries:
+                print(entry)
+        else:
+            print(" ".join(entries))
+    except:
+        print(f"ls can not access this directory: {path}")

implement-shell-tools/wc/wc.py

@@ -0,0 +1,82 @@
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog="wc shell tool",
+    description="making wc tool with python"
+)
+
+parser.add_argument(
+    "files",
+    nargs="+",
+    help="file or files to work on"
+)
+parser.add_argument(
+    "-w",
+    action="store_true",
+    help="counting words"
+)
+parser.add_argument(
+    "-l",
+    action="store_true",
+    help="counting lines"
+)
+parser.add_argument(
+    "-c",
+    action="store_true",
+    help="counting char"
+)
+
+args = parser.parse_args()
+
+total_lines = 0
+total_words = 0
+total_chars = 0
+
+for file in args.files:
+    try:
+        if os.path.isdir(file):
+            print(f"wc: {file}: read: Is a directory")
+            continue
+
+        with open(file, "rb") as f:
+            content = f.read()
+            word_count = len(content.decode('utf-8', errors='ignore').split())
+            line_count = content.count(b"\n")
+            char_count = len(content)
+
+            total_lines += line_count
+            total_words += word_count
+            total_chars += char_count
+
+            output_parts = []
+            if args.l:
+                output_parts.append(f"{line_count:>7}")
+            if args.w:
+                output_parts.append(f"{word_count:>7}")
+            if args.c:
+                output_parts.append(f"{char_count:>7}")
+
+            if not args.w and not args.l and not args.c:
+                print(f"{line_count:>7}{word_count:>7}{char_count:>7} {file}")
+            else:
+                output_parts.append(f" {file}")
+                print("".join(output_parts))
+
+    except FileNotFoundError:
+        print(f"wc: {file}: open: No such file or directory")
+
+if len(args.files) > 1:
+    total_parts = []
+    if args.l:
+        total_parts.append(f"{total_lines:>7}")
+    if args.w:
+        total_parts.append(f"{total_words:>7}")
+    if args.c:
+        total_parts.append(f"{total_chars:>7}")
+
+    if not args.w and not args.l and not args.c:
+        print(f"{total_lines:>7}{total_words:>7}{total_chars:>7} total")
+    else:
+        total_parts.append(" total")
+        print("".join(total_parts))