This post is also available at my personal web site: http://milosophical.me/blog/2006/10/27/cygwin-users-and-groups.html
When you first install cygwin and run bash, it’ll usually display this error message:
Your group is currently "mkpasswd". This indicates that the /etc/passwd (and possibly /etc/group) files should be rebuilt. See the man pages for mkpasswd and mkgroup then, for example, run mkpasswd -l [-d] > /etc/passwd mkgroup -l [-d] > /etc/group Note that the -d switch is necessary for domain users.