Tab completion is pushing the tab key at the command line or in an editor (it's often not tab in an editor, eclipse uses control-space I think). The computer wi

Tab completion is pushing the tab key at the command line or in an editor (it's often not tab in an editor, eclipse uses control-space I think). The computer will then complete what you were typing for you as if by magic. I have written whole dissertations just by typing the title and then leaving a heavy book on the tab key. Different commands lines and editors vary, but in general tab completion will complete the current word/filename/command if it is unambiguous, and provide some kind of listing if it is ambiguous -- so on the bash command line it will beep if it can't complete, but pushing tab twice will then show all the possible completion.