group
 

How to change user's primary group & see the primary group of user?

Nothing to do with Networking. Moved to Linux - Newbie. You might also like to say please or thankyou when asking for help in future posts. thanks.

and that'll be the chgrp command.

You can list the groups you are a member of with the "group" command. To change your primary group, use the root command "usermod". See the usermod man page for details. You will probably want to use the chgrp command for your $HOME directory and all files and directories inside.