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Builtin Commands
================
Applications which subclass :class:`cmd2.Cmd` inherit a number of commands
which may be useful to your users. Developers can
:ref:`features/builtin_commands: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 :ref:`features/shortcuts_aliases_macros:Aliases` for more
information.
edit
~~~~
This command launches an editor program and instructs it to open the given file
name. Here's an example:
.. code-block:: text
(Cmd) edit ~/.ssh/config
The program to be launched is determined by the value of the
:ref:`features/settings: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 :ref:`features/help:Help` for more
information.
history
~~~~~~~
This command allows you to view, run, edit, save, or clear previously entered
commands from the history. See :ref:`features/history:History` for more
information.
ipy
~~~
This optional opt-in command enters an interactive IPython shell. See
:ref:`features/embedded_python_shells: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 :ref:`features/shortcuts_aliases_macros:Macros` for more
information.
py
~~
This command invokes a Python command or shell. See
:ref:`features/embedded_python_shells:Embedded Python Shells` for more
information.
quit
~~~~
This command exits the ``cmd2`` application.
.. _feature-builtin-commands-run-pyscript:
run_pyscript
~~~~~~~~~~~~
This command runs a Python script file inside the ``cmd2`` application.
See :ref:`features/scripting: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 :ref:`features/scripting: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 :ref:`features/builtin_commands: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 :ref:`features/scripting:Running
Command Scripts` for more information.
set
~~~
A list of all user-settable parameters, with brief comments, is viewable from
within a running application:
.. code-block:: text
(Cmd) set --verbose
allow_style: 'Terminal' # Allow ANSI text style sequences in output (valid values: Terminal, Always, Never)
always_show_hint: False # Display tab completion hint even when completion suggestions print
debug: True # Show full traceback on exception
echo: False # Echo command issued into output
editor: 'vi' # Program used by 'edit'
feedback_to_output: False # Include nonessentials in '|', '>' results
max_completion_items: 50 # Maximum number of CompletionItems to display during tab completion
quiet: False # Don't print nonessential feedback
timing: False # Report execution times
Any of these user-settable parameters can be set while running your app with
the ``set`` command like so:
.. code-block:: text
(Cmd) set allow_style Never
See :ref:`features/settings:Settings` for more information.
shell
~~~~~
Execute a command as if at the operating system shell prompt:
.. code-block:: text
(Cmd) shell pwd -P
/usr/local/bin
shortcuts
~~~~~~~~~
This command lists available shortcuts. See
:ref:`features/shortcuts_aliases_macros:Shortcuts` for more information.
Remove Builtin Commands
-----------------------
Developers may not want to offer the commands builtin to :class:`cmd2.Cmd`
to users of their application. To remove a command you must delete the method
implementing that command from the :class:`cmd2.Cmd` object at runtime.
For example, if you wanted to remove the :ref:`features/builtin_commands:shell`
command from your application::
class NoShellApp(cmd2.Cmd):
"""A simple cmd2 application."""
delattr(cmd2.Cmd, 'do_shell')
|
