root@Juventus:~# for g in adm, dip, lpadmin, admin, slocate; do gpasswd -d ali $g ; done
unknown group: adm,
gpasswd: Permission denied.
unknown group: dip,
gpasswd: Permission denied.
unknown group: lpadmin,
gpasswd: Permission denied.
unknown group: admin,
gpasswd: Permission denied.
Removing user ali from group slocate
root@Juventus:~# id
uid=0(root) gid=0(root) groups=0(root)