I have just read this article: http://www.howtoforge.com/linux_remove_users And my question is: In stop 3, instead of changing the login shell to /dev/null or whatever, could I just remove the line pertaining to that user? And the whole process seems strange to me. Disabling the user password and changing their shell, removing their files from the system and killing their process. All of that seem to me to disable the user, but doesn't actually remove them from the system. Or does it? Can someone enlighten me on this?