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How to change primary user group of a user? Preferably without losing the current primary group altogether as the user is part of 'staff' ie. admin. I suppose I could create another admin user and then recreate the original user, but is there a simpler way?

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2 Answers

Use usermod(1M):

# usermod -g PRIMARY_GROUP -G SECONDARY_GROUP username
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Have you tried the newgrp command?

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newgrp changes the group for just the current login session, usermod as suggested by @gtirloni changes the default groups defined in the passwd and group files for all future logins. –  alanc Sep 2 '12 at 8:08
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