The mkgroup program can be used to help configure your Windows system to be more UNIX-like by creating an initial /etc/group. Its use is essential on the NT series (Windows NT, 2000, and XP) to include Windows security information.

For more information, see this page http://cygwin.com/cygwin-ug-net/using-utils.html#mkgroup

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Thanks to Ron Dozier of University of Delaware for his suggestion.