ali@Juventus:~$ for g in adm, dip, lpadmin, admin, slocate; do gpasswd -d ali $g ; done
unknown group: adm,
gpasswd: Permission denied.
unknown group: dip,
gpasswd: Permission denied.
unknown group: lpadmin,
gpasswd: Permission denied.
unknown group: admin,
gpasswd: Permission denied.
gpasswd: Permission denied.
ali@Juventus:~$ id
uid=1000(ali) gid=1000(ali) groups=4(adm),20(dialout),24(cdrom),25(floppy),27(sudo),29(audio),30(dip),33(www-data),44(video),46(plugdev),104(scanner),108(lpadmin),110(admin),119(slocate),120(mysql),1000(ali)