Need A UNIX Shell that runs in MS WinXP?

Need A UNIX Shell that runs in MS WinXP-- could even be a simulator--so I can practice/learn basic commands like, you know, ls, mkdir, cat, etc, etc, and maybe even run scripts.





Real UNIX shell, free d/l is best, of course. But I can compromise as long as it's a valid/good learning./practice tool. Small install is better... thank you much.

Need A UNIX Shell that runs in MS WinXP?
Try searching for cygwin, this is a free download, and incorporates all the elements of a Unix based system, including xwindows.