How to check which group a user belongs to in Linux

View method: 1. Directly execute the "groups" command to view the groups to which the current user belongs; 2. Execute the "groups username" command to view the groups to which the specified user belongs; 3. Execute "id username" command to view the groups to which the specified user belongs; 4. Execute the "cat /etc/group" command to output the group file information.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Linux method to check which group a user belongs to:

Method 1: Use groups directly to view The group to which the current user belongs

# groups
root

Method 2: Use groups username to view the group to which the specified user belongs

# groups xly
xly : xly

Method 3: Use id username to view the group to which the specified user belongs

# id xly
uid=500(xly) gid=500(xly) groups=500(xly)

Method 4: Directly view the group file, cat /etc/group

# 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:

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