Built on the .NET Framework, Windows PowerShell is a task-based command-line shell and scripting language; it is designed specifically for system administrators and power-users, to rapidly automate the administration of multiple operating systems (Linux, macOS, Unix, and Windows) and the processes related to the applications that run on those operating systems.+
PowerShell is now open source
PowerShell base source code is now available in GitHub and open to community contributions, see PowerShell.+
You can start with the bits you need at get PowerShell. Or, perhaps, with a quick tour at Getting Started
