implement cat

Author: PratiAmalden

implement-shell-tools/cat/cat.py

@@ -0,0 +1,36 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat",
+    description="read, display, and concatenate text files.",
+)
+
+parser.add_argument("-n", action="store_true", help="Number all output lines.")
+parser.add_argument("-b", action="store_true", help="Number non-blank output lines.")
+parser.add_argument("paths",nargs="+", help="The file to search")
+
+args = parser.parse_args()
+
+for path in args.paths:
+    try:
+        with open(path, mode='r', encoding='utf-8') as f:
+            lines = f.readlines()
+
+    except Exception as err:
+        print(f"Error reading file '{path}': {err}")
+        continue
+
+    line_num = 1
+
+    for line in lines:
+        if args.b:
+            if line.strip() != "":
+                print(f"{line_num:5} {line}", end="")
+                line_num += 1
+            else:
+                print()
+        elif args.n:
+            print(f"{line_num:5} {line}", end="")
+            line_num += 1
+        else:
+            print(line, end="")