finished cat.py

Author: M-Abdoon

implement-shell-tools/cat/cat.py

@@ -0,0 +1,29 @@
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("files", nargs="+")
+parser.add_argument("-n", action="store_true")
+parser.add_argument("-b", action="store_true")
+
+args = parser.parse_args()
+
+line_number = 1
+
+for file in args.files:
+    try:
+        f = open(file, "r")
+
+        for line in f:
+            if args.b and line.strip() != "":
+                print(f"     {line_number}", line, end="")
+                line_number += 1
+            elif args.n and not args.b:
+                print(f"     {line_number}", line, end="")
+                line_number += 1
+            else:
+                print(line, end="")
+
+        f.close()
+
+    except:
+        print("cat:", file, "not found")