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This question already has an answer here:

I'm trying to add an existing group to my user, but it says -bash: usermod: command not found. When I locate usermod nothing comes up. man usermod returns nothing either. I thought usermod was built in Macs? I'm using Mac OS X + Terminal.

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marked as duplicate by gronostaj, soandos, tombull89, mpy, Shinrai Jul 5 '13 at 16:17

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Apparently not, but:… – daxlerod Jul 3 '13 at 18:03
up vote 3 down vote accepted

I can't comment :( so I apologize for answering with a link but:

How to add user to a group from Mac OS X command line?

This should do what you're looking for, shouldn't it?

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