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First thing I install on any windows machine is Cygwin. The standard windows shell it too poor for any serious automation and lacks SSH.
Having said that I have been using powershell recently and find some tasks are simpler and quicker in that than using a typical Korn Shell with a bit of Sed / Awk and Perl to process the pipeline.
They aren't particularly TLAs. These are the names of simple domain specific languages and should in the tool belt of anyone who considers them self a power user or programmer. In unix like environments you can treat the output of commands as a string of text and process it in a pipeline.Please don't use TLAs
git client
... a GIT repository.
Actually started using Cygwin again after it being mentioned upthread.