Linux shell equivalent on IIS

Depending on what version of IIS you're considering, I would second lbrandy's recommendation to check out PowerShell. Microsoft is working on a PowerShell provider for IIS (specifically version 7). There is a decent post about this at http://blogs.iis.net/thomad/archive/2008/04/14/iis-7-0-powershell-provider-tech-preview-1.aspx. The upcoming version of PowerShell will also add remoting capabilities so that you can remotely manage machines. PowerShell is quite different from *NIX shells, though, so that is something to consider.

Hope this helps.

Are you asking about Linux shell as in an environment to work in? For that CygWin I think has been around the longest and is pretty robust: http://www.cygwin.com/

A while ago I found a windows port of all the popular linux commands I use (ls, grep, diff) and I simply unzip those to a file, add it to my PATH environment and then can run from there: http://unxutils.sourceforge.net/

Or are you talking about executing shell commands from within your code? If you're in the .NET sphere, there is the Process.Start() method that will give you a lot of options.

Hope this helps!