How to run Unix commands in windows ?

There are multiple ways to use and to run Unix commands in Windows.

And why would you like to do that ..because you are Unix-lover, you are used to flexibility, convenience of unix commands e.g. grep, awk, etc.etc., because you like to be cool to use Unix commands on Windows, and list goes on. But on another hand, most owners will be ok to use native Windows utilities and may occasionally use GnuWin32/unixutils to fill in the gaps.

There are solutions - - apart from using virtualization (VMWare, Microsoft Virtual PC, XEN etc) with virtual host ( like unix/linux OS etc) installed on top of windows.

Cygwin - an emulator running on top of windows
http://www.cygwin.com/

Cygwin is a Linux-like environment for Windows. It consists of two parts:

A DLL (cygwin1.dll) which acts as a Linux API emulation layer providing substantial Linux API functionality.

A collection of tools which provide Linux look and feel.

GNUwin32 - a sourceforge project
http://gnuwin32.sourceforge.net/

Ports of tools with a GNU or similar open source license, to MS-Windows (Microsoft Windows 95 / 98 / ME / NT / 2000 / XP / 2003 / Vista / 2008).

Windows versions of many Linux command-line utilities are available. They can be installed individually

UnixUtils - another sourceforge project

http://unxutils.sourceforge.net

ports unix utilities as native way that the executables do only depend on the Microsoft C-runtime (msvcrt.dll) and not an emulation layer.

unxutils is a much lighter weight solution to Cygwin

UWIN package - an AT&T research project under open source Common Public License 1.0 at AT&T AST/UWIN open source downloads.Allows UNIX applications to be built and run on Windows XP/2000/NT/ME/98/95 with few, if any, changes necessary.

http://www.research.att.com/sw/tools/uwin/

Most of the UNIX API is implemented by the POSIX.DLL dynamically loaded (shared) library. Programs linked with POSIX.DLL run under the WIN32 subsystem instead of the POSIX subsystem, so programs can freely intermix UNIX and WIN32 library calls.

Libraries that emulate a UNIX environment by implementing the UNIX Application Programming Interface (API)

Include files and development tools such as cc, yacc, lex, and make.

ksh(1) (the Korn Shell) and over 250 utilities such as ls, sed, cp, stty, etc.

Windows Services for UNIX - "free download" Windows Services for UNIX version provides a full range of cross-platform services for integrating Windows into existing UNIX-based environments.

http://technet.microsoft.com/en-us/interopmigration/bb380242.aspx

These are quite powerful but yet kind of unknown utilities for windows-unit Interoperability.