Users and Groups

User and group membership is set at login time, or by programs like 'newgrp'.

$ id
uid=1000(bree) gid=1000(bree) groups=1000(bree),50(sea),1001(web)

$ grep ^bree /etc/passwd
bree:x:1000:1000:Bree Urban:/home/bree:/usr/bin/ksh

$ grep bree /etc/group
seattle:x:50:bri,reegen,bree,sabrina
bree:x:1000:
web:x:1001:bri,bree