tldr/pages/linux/compgen.md

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# compgen
> A built-in command for auto-completion in bash, which is called on pressing TAB key twice.
- 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 key words:
`compgen -k`
- See all available commands/aliases starting with 'ls':
`compgen -ac {{ls}}`