# Command Completion¶

A generic command completion command is available to generate a bash-completion script. Currently, the command will generate a script for bash versions 3 or 4. There is also a mode that generates only data that can be used in your own script. The command completion script is generated based on the commands and options that you have specified in cliff.

## Usage¶

In order for your command to support command completions, you need to add the cliff.complete.CompleteCommand class to your command manager.

self.command_manager.add_command('complete', cliff.complete.CompleteCommand)


When you run the command, it will generate a bash-completion script:

(.venv)$mycmd complete _mycmd() { local cur prev words COMPREPLY=() _get_comp_words_by_ref -n : cur prev words # Command data: cmds='agent aggregate backup' cmds_agent='--name' ... if [ -z "${completed}" ] ; then
COMPREPLY=( $( compgen -f -- "$cur" ) $( compgen -d -- "$cur" ) )
else
COMPREPLY=( $(compgen -W "${completed}" -- \${cur}) )
fi
return 0
}
complete -F _mycmd mycmd