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# Builtin Commands

Applications which subclass cmd2.Cmd inherit a number of commands which may be useful to your users. Developers can Remove Builtin Commands if they do not want them to be part of the application.

## List of Builtin Commands

### alias

This command manages aliases via subcommands `create`, `delete`, and `list`. See Aliases for more information.

### edit

This command launches an editor program and instructs it to open the given file name. Here's an example:

    (Cmd) edit ~/.ssh/config

The program to be launched is determined by the value of the editor setting.

### help

This command lists available commands or provides detailed help for a specific command. When called with the `-v/--verbose` argument, it shows a brief description of each command. See Help for more information.

### history

This command allows you to view, run, edit, save, or clear previously entered commands from the history. See History for more information.

### ipy (optional)

This optional opt-in command enters an interactive
IPython shell. See IPython (optional) for more information.

### macro

This command manages macros via subcommands `create`, `delete`, and `list`. A macro is similar to an alias, but it can contain argument placeholders. See Macros for more information.

### py (optional)

This optional opt-in command invokes a Python command or shell. See Embedded Python Shells for more information.

### quit

This command exits the `cmd2` application.

### run_pyscript

This command runs a Python script file inside the `cmd2` application. See Python Scripts for more information.

### run_script

This command runs commands in a script file that is encoded as either ASCII or UTF-8 text. See Command Scripts for more information.

### _relative_run_script

This command is hidden from the help that's visible to end users. It runs a script like run_script but does so using a path relative to the script that is currently executing. This is useful when you have scripts that run other scripts. See Running Command Scripts for more information.

### set

A list of all user-settable parameters, with brief comments, is viewable from within a running application:

    (Cmd) set
     Name                     Value      Description
    ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
     allow_style              Terminal   Allow ANSI text style sequences in output (valid values: Always, Never, Terminal)
     always_show_hint         False      Display tab completion hint even when completion suggestions print
     debug                    False      Show full traceback on exception
     echo                     False      Echo command issued into output
     editor                   vim        Program used by 'edit'
     feedback_to_output       False      Include nonessentials in '|' and '>' results
     foreground_color         cyan       Foreground color to use with echo command
     max_completion_items     50         Maximum number of CompletionItems to display during tab completion
     quiet                    False      Don't print nonessential feedback
     scripts_add_to_history   True       Scripts and pyscripts add commands to history
     timing                   False      Report execution times

Any of these user-settable parameters can be set while running your app with the `set` command like so:

    (Cmd) set allow_style Never

See Settings for more information.

### shell

Execute a command as if at the operating system shell prompt:

    (Cmd) shell pwd -P
    /usr/local/bin

### shortcuts

This command lists available shortcuts. See Shortcuts for more information.

## Remove Builtin Commands

Developers may not want to offer all the commands built into cmd2.Cmd to users of their application. To remove a command you must delete the method implementing that command from the cmd2.Cmd object at runtime. For example, if you wanted to remove the shell command from your application:

    class NoShellApp(cmd2.Cmd):
        """A simple cmd2 application."""

        delattr(cmd2.Cmd, 'do_shell')