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How do I add a user to a group.

This is on a system with no root password and only a single user pi with sudo privileges.

usermod seems to have been designed to make this as difficult as possible.

  • usermod -a -G groupname username doesn't work on raspbian? – jimmij Jun 30 '16 at 6:11
  • @jimmij I think I was missing the -a I was going from a book on Ubuntu which said -G didn't work if the user is logged in, and it didn't seem to work. – Milliways Jun 30 '16 at 6:50
  • Without -a groups are overwritten, this is most of the time not what you want to do, unless you create new user. – jimmij Jun 30 '16 at 6:56
  • you use -G when adding new user and want it to be a member of supplementary group along with primary group , otherwise you can use usermod with -aG – Ijaz Ahmad Khan Jun 30 '16 at 7:39
  • The usermod works whether the user is logged in or not, however it only affects new sessions; current sessions don't pick up the change. So after the usermod you should logout and login again. – Stephen Harris Jun 30 '16 at 10:49
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You can use usermod or edit the group file directly

# usermod -a -G ${group} ${user}

# vi /etc/group
...
wheel:x:10:root,user1,user2
...

Just remember group changes do not always propagate to active sessions. If you are changing your own user logout and then log back in.

  • 1
    I had to use -G flag instead of G alone – Jules Randolph May 4 '18 at 22:07

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