The Bash shell (as of version 2.04) supports tab completion. By default if tab completion is activated (you hit the tab key once) no results are shown if more than one match exists. To view all matching completions you must hit the tab key a second time.
If you would like the completion feature to always return all results when pressing the tab key once
add the following to ~/.inputrc
(you may either source
.inputrc
or restart bash.
set show-all-if-ambiguous on