Powershell, Powershell, Powershell! Seriously, people, if you have to use a windows system, put some time into learning Powershell.
* Most simple grep and sed commands are entirely do-able. Bit more verbose syntax, but that comes with a hell of a lot of easy-to-access power
* It's all about objects, rather than plain text. This can often be a pain, but Import-Csv and Export-Csv are utter LOVE. Adding additional new properties could be easier, but it is an option and can be used to great effect
* It's basically .Net for the command line, and you can get to all the power locked away in the .Net libraries
* No installation required on modern windows machines. Assuming your network admins are not overly restrictive, you get a proper shell without having to install cygwin