PowerShellopen source reimplementation for "others" (Mac, Linux, Solaris, etc...)and Windows (including Windows Mobile and Windows CE)
                                                              About the namePash = Posh (PowerShell) + bash(one of the Unix shells)
GoalsThe main goal is to provide a rich shell environment for otheroperating systems as well as to provide a hostable scripting engine forrich applications. The user experience should be seamless for peoplewho are used to Windows version of PowerShell. The scrips, cmdlets andproviders should runs AS-IS (if they are not using Windows-specific functionality).The rich applications that host PowerShell should run on any otheroperating system AS-IS. Secondary goal: the scripts should run acrossthe machines and different OS's seamlesly (but following all thesecurity guidelines).
EnvironmentThe current implementation of Pash is written using pure .Net 2.0.It compiles on VS 2008 as well as on Mono. So all the developers canchoose the environment that fits their needs and preferences. Theproduced assemblies can be executed "right out of the box" on Windows, Linux, Mac (or others) without any additional recompilation. Note: for Windows Mobile and Windows CE the produced code should be recompiled against the .NET Compact Framework.
ProgressYou're welcome to get the source code and contribute to the Pash public effort @ http://sourceforge.net/projects/pash.
                                                                                               
                                                  ~50% of public PowerShell classes defined.
~40% of framework functionality operational.
Stay tuned for more detailed info. Trying to figure out how to produce the similar class diff that Mono project is using.
                                                Grammar                                                It's a pretty challenging to defined the grammar                                                correctly since there is no publicly available complete                                                grammar description. The only more-or-less complete PoSH                                                grammar description can be find in the Appendix C of the                                                "Power Shell in Action".
                                                See the current status of the                                                rules implementation.
Screenshots

Windows (duh !..)

Pash on Mono + SuSE Linux

Pash on Compact .NET Framework

and (drum roll ...) Pash on Mac

官方：http://pash.sourceforge.net/