Server 2012 Server Core powershell not installed

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http://serverfault.com – In server core, after a restart powershell was all of a sudden not installed, what do I do to reinstall it? I do not have remote administration set up yet so I cannot use that to re-install it. 'powershell' is not recognized as an internal or external command, operable program, or batch file. (HowTos)