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compgen

A built-in command for auto-completion in Bash, which is called on pressing TAB key twice. More information: https://www.cyberciti.biz/open-source/command-line-hacks/compgen-linux-command/.

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}}