feat:implement cat

Author: AhmadHmedann

implement-shell-tools/cat/cat.py

@@ -0,0 +1,28 @@
+import argparse
+
+parser = argparse.ArgumentParser(
+    prog="cat",
+    description="implement cat",
+)
+
+parser.add_argument("paths", nargs="+", help="The file to process")
+parser.add_argument("-n", action="store_true", help="Number all lines")
+parser.add_argument("-b", action="store_true", help="Number non-empty lines only")
+
+args = parser.parse_args()
+counter = 1
+
+for path in args.paths:
+    with open(path, "r") as f:
+        for line in f:
+            if args.n:
+                print(f"\t{counter} {line}", end="")
+                counter += 1
+            elif args.b:
+                if line.strip() != "":
+                    print(f"\t{counter} {line}", end="")
+                    counter += 1
+                else:
+                    print(f"\t {line}", end="")
+            else:
+                print(f" {line}", end="")