compgen

A built-in command for auto-completion in Bash, which is called on pressing TAB key twice. More information: https://www.gnu.org/software/bash/manual/bash.html#index-compgen.

• List all commands that you could run:

compgen -c

• 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