[Docker](http://www.docker.io) is an open-source project to easily create lightweight, portable, self-sufficient containers from any application. The same container that a developer builds and tests on a laptop can run at scale, in production, on VMs, bare metal, OpenStack clusters, public clouds and more.
Windows PowerShell (POSH) is a command-line shell and associated scripting language created by Microsoft. Offering full access to COM, WMI and .NET, POSH is a full-featured task automation framework for distributed Microsoft platforms and solutions.
This is for anything regarding the command line, in any operating system. All questions (including dumb ones), tips, and interesting programs/console applications you've found or made yourself are welcome. Linux / BSD / OSX / Windows CLI apps or questions or comments, we're happy to take them all!