Linux Administration Cookbook

Groups on a system

Groups are discovered in a similar fashion to users, and again, you won't have created most of them.

For CentOS, note the following:

$ cat /etc/grouproot:x:0:bin:x:1:daemon:x:2:sys:x:3:adm:x:4:tty:x:5:disk:x:6:lp:x:7:mem:x:8:kmem:x:9:wheel:x:10:<SNIP>postfix:x:89:chrony:x:996:screen:x:84:vagrant:x:1000:vagrantpackt:x:1001:

And for Ubuntu, note the following:

$ cat /etc/grouproot:x:0:daemon:x:1:bin:x:2:sys:x:3:adm:x:4:syslog,ubuntutty:x:5:<SNIP>landscape:x:112:admin:x:113:netdev:x:114:ubuntuvboxsf:x:115:vagrant:x:1000:ubuntu:x:1001:

I've emboldened the first big difference between this Ubuntu and CentOS system, namely the wheel and admin groups. wheel doesn't exist on our Ubuntu system, because it's been replaced by the ...