How to check which group a user belongs to in Linux

There are many ways to view the groups to which a user belongs in Linux:

Command groups to view the groups to which the current user belongs

[root@localhost xly]# groups
root

groups users (view the groups to which the user belongs)

[root@localhost xly]# groups xly
xly : xly

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id user (view the group to which the user belongs)

[root@localhost xly]# id xly
uid=500(xly) gid=500(xly) groups=500(xly)

View the group file directly, cat /etc/group

[root@localhost xly]# cat /etc/group
root:x:0:
bin:x:1:bin,daemon
daemon:x:2:bin,daemon
sys:x:3:bin,adm
adm:x:4:adm,daemon
tty:x:5:
disk:x:6:
lp:x:7:daemon
mem:x:8:
kmem:x:9:
xly:x:500:

cat group name, used to find a user group

cat /etc/group|grep

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