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# Useful commands
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create group
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`groupadd GROUPNAME`
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check group exists
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`grep GROUPNAME /etc/group`
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add user to group (a=append, G=groupname that follows)
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`usermod -a -G GROUPNAME USERNAME`
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change group owner (R=recursive)
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`chgrp -R GROUPNAME FILE/FOLDERNAME`
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allow group to write to folder
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`chmod -R g+w GROUPNAME` |
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