`cut`¶

All groups in the system

$ cut -d : -f 1 /etc/group
root
bin
daemon
sys
adm
tty
disk
...

All groups in the system, together with their IDs

$ cut -d : -f 1,3 --output-delimiter ' ' /etc/group|head
root 0
bin 1
daemon 2
sys 3
adm 4
tty 5
disk 6
...

cut¶