Added the list command.

cli/cli.py

@@ -4,10 +4,11 @@
 
 import typer
 
-from commands import hello, version
+from commands import hello, list, version
 
 app = typer.Typer(help="101 Linux Commands CLI 🚀")
 app.add_typer(hello.app, name="hello")
+app.add_typer(list.app, name="list")
 app.add_typer(version.app, name="version")
 
 

cli/commands/list.py

@@ -0,0 +1,15 @@
+import typer
+
+app = typer.Typer(help="List the commands available on Linux.")
+
+
+@app.callback(invoke_without_command=True)
+def list():
+    commands = [
+        "ls - List directory contents.",
+        "cd - Change directory.",
+        "pwd - Print working directory.",
+        "cat - Concatenate and display files.",
+    ]
+    for command in commands:
+        typer.echo(command)

cli/test_cli.py

@@ -58,6 +58,20 @@ def test_hello_help():
     assert "Hello command group" in result.stdout
 
 
+def test_list_command():
+    """Test the list command."""
+    result = subprocess.run(
+        [sys.executable, "cli.py", "list"],
+        capture_output=True,
+        text=True,
+        cwd=os.path.dirname(__file__),
+    )
+    assert "ls - List directory contents." in result.stdout
+    assert "cd - Change directory." in result.stdout
+    assert "pwd - Print working directory." in result.stdout
+    assert "cat - Concatenate and display files." in result.stdout
+
+
 def test_version_command():
     """Test the version command"""
     result = subprocess.run(
@@ -88,6 +102,7 @@ def test_version_show_command():
     test_hello_command()
     test_hello_command_with_name()
     test_hello_help()
+    test_list_command()
     test_version_command()
     test_version_show_command()
     print("✅ All tests passed!")