$ id
uid=1000(mizna) gid=1000(mizna) groups=4(adm),20(dialout),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),106(lpadmin),110(scanner),112(admin),1000(mizna),1001(hamachi)
$ id hal
id: hal: No such user
$ id haldaemon
uid=108(haldaemon) gid=108(haldaemon) groups=108(haldaemon),24(cdrom),25(floppy),46(plugdev)
$ uname -a
Linux tykho 2.6.15-23-386 #1 PREEMPT Tue May 23 13:49:40 UTC 2006 i686 GNU/Linux
... and here are the rest; hope this helps:
$ id 4(adm), 20(dialout) ,24(cdrom) ,25(floppy) ,29(audio) ,30(dip) ,44(video) ,46(plugdev) ,106(lpadmin) ,110(scanner) ,112(admin) ,1000(mizna) ,1001(hamachi)
uid=1000(mizna) gid=1000(mizna) groups=
$ id hal
id: hal: No such user
$ id haldaemon 108(haldaemon) ,24(cdrom) ,25(floppy) ,46(plugdev)
uid=108(haldaemon) gid=108(haldaemon) groups=
$ uname -a
Linux tykho 2.6.15-23-386 #1 PREEMPT Tue May 23 13:49:40 UTC 2006 i686 GNU/Linux