Context sensitive auto-completion using PowerShell, PowerTab and GIT Posted on October 13, 2008. Filed under: GIT, powershell, ruby, vista, windows | Powertab is an Awesome PowerShell TabExpansion extension. It extends the default PowerShell autocompletion and shows the results like: The best part is that it is easily customizable. One way to customize it is by editing it Tab Expansion database fi