root@Juventus:/home/ali# for g in adm dip lpadmin admin slocate; do gpasswd -d ali $g ; done
Removing user ali from group adm
gpasswd: unknown member ali
Removing user ali from group dip
gpasswd: unknown member ali
Removing user ali from group lpadmin
gpasswd: unknown member ali
Removing user ali from group admin
gpasswd: unknown member ali
Removing user ali from group slocate
gpasswd: unknown member ali