What are the ways for linux to check which group a user belongs to?

What are the ways for linux to see which group a user belongs to? Many people do not understand, today, in order to let you know more about linux to see which group users belong to, so give you a summary of the following content, let's look down together.

There are many ways for linux to view the group to which a user belongs:

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

[root@localhost xly] # groupsroot

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

[root@localhost xly] # groups xlyxly: xly

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

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

View the group file directly, cat / etc/group

[root@localhost xly] # cat / etc/grouproot:x:0:bin:x:1:bin,daemondaemon:x:2:bin,daemonsys:x:3:bin,admadm:x:4:adm,daemontty:x:5:disk:x:6:lp:x:7:daemonmem:x:8:kmem:x:9:xly:x:500:

Cat group name, which is used to find a user group

Cat / etc/group | grep

These are the details of linux's method of checking which group the user belongs to, and whether there is any gain after reading it? If you want to know more about it, welcome to the industry information!