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A built-in command for auto-completion in Bash, which is called on pressing TAB key twice. More information:

  • 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}}