windows GUN utilites

http://www.cyberciti.biz/faq/unix-command-line-utilities-for-windows/

Cygwin

Cygwin provides native integration of Windows-based applications, data, and other system resources with applications, software tools, and data of the Unix-like environment. Thus it is possible to launch Windows applications from the Cygwin environment, as well as to use Cygwin tools and applications within the Windows operating context.

• Download cygwin

GNU Utilities For Win32

Here are some ports of common GNU utilities to native Win32. In this context, native means the executables do only depend on the Microsoft C-runtime (msvcrt.dll) and not an emulation layer like that provided by Cygwin tools. If you don't care about having a full UNIX shell environment, this is a great download for you.

• Download GNU Utilities For Win32

GnuWin

GnuWin provides Win32-versions of GNU tools, or tools with a similar open source licence. The ports are native ports, that is they rely only on libraries provided with any 32-bits MS-Windows operating system, such as MS-Windows 95 / 98 / 2000 / NT / XP / Vista etc.

• Download GnuWin

40 UNIX Commands Ported To DOS

A little outdated but provides 40 UNIX utilities for DOS and it may work under earlier version of Windows too.