What's the software that enables lot of linux commands on windows?

MinGW (Minimalist GNU for Windows)

Microsoft Windows Services for UNIX

"I love MinGW. It gives you a Unix console complete with bash shell, and all your faves -- ls, rm, mv, cp, grep, tar, find, emacs, vim, svn, git, etc. When you're using it, you're in bash (or whatever your preferred shell is) just like a Linux box.

It gives you searchable command history that survives the machine being restarted.

I find its way of handling paths much more intuitive and convient than Cygwin's."