Username ändern (von tom zu jerry)
uid=1000(tom) gid=1000(tom) usermod -l jerry tom id jerry uid=1000(jerry) gid=1000(tom)
User-ID ändern (1000 zu 2000)
id jerry uid=1000(jerry) gid=1000(tom) usermod -u 2000 jerry id jerry uid=2000(jerry) gid=1000(tom)
Gruppenname ändern (von tom zu jerry)
id jerry uid=2000(jerry) gid=1000(tom) groupmod -n jerry tom id jerry uid=2000(jerry) gid=1000(jerry)
Gruppen-ID ändern (1000 zu 2000)
id jerry uid=2000(jerry) gid=1000(jerry) groupmod -g 2000 id jerry uid=2000(jerry) gid=2000(jerry)
User zu sekundären Gruppen hinzufügen
id jerry uid=2000(jerry) gid=1000(tom) usermod -G mouse,cartoon jerry id jerry uid=2000(jerry) gid=1000(jerry) groups=5001(mouse),4001(cartoon)
Primäre Gruppe des Users ändern
id jerry uid=2000(jerry) gid=1000(jerry) groups=5001(mouse),4001(cartoon) usermod -g jerry_new jerry id jerry uid=2000(jerry_new) gid=1000(jerry) groups=5001(mouse),4001(cartoon)