Autocomplete

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Bash command completion (autocomplete), is a built-in bash function.
See man complete or man bash in the 'complete' section.

By default, bash does not autocomplete bash aliases. Here is a feature request filed for it:
http://savannah.gnu.org/support/index.php?108476

/usr/share/bash-completion
/etc/bash_completion.d/

It is said that the zsh shell has a more powerful, flexible command autocompletion implementation than bash.