Say
you've lost your account password, you don't have a system CD on hand, and you didn't enable root. Say you have no other way to log into that machine. Say you need access to the files on that machine right now. Say you're in deep you-know-what, bucko. Fortunately, there's a five minute fix -- all it takes is a little digging into the command line, and you're on your way
Check It Out: No Password, No Root, No CD? No Problem.