tldr/pages/common/compgen.md

compgen

Bash built-in command for generating possible completion matches in Bash. Usually used within custom completion functions. See also: complete, compopt. More information: https://www.gnu.org/software/bash/manual/bash.html#index-compgen.

• List all shell built-ins, aliases, functions and executables that you could run:

compgen -c

• List all commands that you could run that start with a specified string and save results to COMPREPLY:

compgen -V COMPREPLY -c {{str}}

• Match against a wordlist:

compgen -W "{{apple orange banana}}" {{a}}

• List all aliases:

compgen -a

• List all functions that you could run:

compgen -A function

• Show shell reserved keywords:

compgen -k

• See all available commands/aliases starting with 'ls':

compgen -ac {{ls}}

• List all users on the system:

compgen -u