On Sat, Mar 22, 2003 at 02:44:48PM -0800, johnd wrote: > Why are there primary groups in UNIX? > > why not just have users and groups? > > users can be added groups and not need a primary group. The primary group is used to specify which gid is used when a user creates a file. That's the one good use I can think of off the top of my head... -Jon