Trang Do | Oct2025-1 | Tools | Sprint 4 | Implement shell tools python

implement-shell-tools/cat/cat.py

@@ -0,0 +1,39 @@
+import sys
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat",
+    description="Reading the file and print the content",
+)
+
+parser.add_argument("-n", help="Number all lines")
+parser.add_argument("-b", help="Number only lines with content")
+parser.add_argument("paths", nargs="+", help="The file path to process")
+
+args = parser.parse_args()
+paths = args.paths
+
+for path in paths:
+    try:
+        with open(path, "r") as f:
+            content = f.read()
+        lines = content.split("\n")
+        lines.pop()
+
+        line_num = 1
+
+        for i in range(len(lines)):
+            line = lines[i]
+            if args.n:
+                print(f"{line_num} {line}")
+                line_num += 1
+
+            elif args.b:
+                if line != "":
+                    print(f"{line_num} {line}")
+                    line_num += 1
+            else:
+                print(line)
+
+    except Exception as e:
+        print(f"Error reading {path}: {e}")

implement-shell-tools/ls/ls.py

@@ -0,0 +1,27 @@
+import sys
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog="ls",
+    description="List all files name",
+)
+
+parser.add_argument("-1", dest="one", action="store_true", help="A new line for each file")
+parser.add_argument("-a", action="store_true", help="Show hidden files")
+parser.add_argument("path", nargs="?", default=".", help="The directory to list")
+
+args = parser.parse_args()
+path = args.path
+
+try:
+    files = os.listdir(path)
+    if not args.a:
+        files = [file for file in files if not file.startswith(".")]
+    if args.one:
+        print("\n".join(files))
+    else:
+        print("       ".join(files))
+
+except Exception as e:
+    print(f"Error reading {path}: {e}")

implement-shell-tools/wc/wc.py

@@ -0,0 +1,54 @@
+import sys
+import argparse
+import os
+
+parser = argparse.ArgumentParser(
+    prog="wc",
+    description="Word count",
+)
+
+parser.add_argument("-l", action="store_true", help="Count lines")
+parser.add_argument("-w", action="store_true", help="Count words")
+parser.add_argument("-c", action="store_true", help="Count bytes")
+parser.add_argument("paths", nargs="+", help="The files to process")
+
+args = parser.parse_args()
+
+totalLines = 0
+totalWords = 0
+totalBytes = 0
+
+for path in args.paths:
+    try:
+        with open(path, "rb") as f:
+            buffer = f.read()
+        content = buffer.decode("utf-8") #, errors="ignore"
+
+        lines = len(content.split("\n")) - 1
+        wordCount = len(content.strip().split())
+        bytes = len(buffer)
+
+        totalLines += lines
+        totalWords += wordCount
+        totalBytes += bytes
+
+        if args.l:
+            print(f"{lines}      {path}")
+        elif args.w:
+            print(f"{wordCount}      {path}")
+        elif args.c:
+            print(f"{bytes}      {path}")
+        else:
+            print(f"{lines}      {wordCount}       {bytes}      {path}")
+    except Exception as e:
+        print(f"Error reading {path}: {e}")
+
+if len(args.paths) > 1:
+    if args.l:
+        print(f"{totalLines}      total")
+    elif args.w:
+        print(f"{totalWords}      total")
+    elif args.c:
+        print(f"{totalBytes}      total")
+    else:
+        print(f"{totalLines}      {totalWords}      {totalBytes}      total")