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Check the groups to which a user belongs.

Check the groups to which a user belongs

Check the group in /etc/passwd and /etc/group (check the gid)
Users always belong to a group, and the group described in the /etc/passwd and /etc/group files is the primary group.
The gid (group ID) is stored in the /etc/passwd and /etc/group files

$ grep sampleuser /etc/passwd
sampleuser:x:1002:1003::/home/sampleuser:/bin/bash
$ grep sampleuser /etc/group
sampleuser:x:1003:

●Check the group with the id command
The id command specifies the user name as an argument.
The uid displays the user group, the gid displays the primary group, and the affiliation group displays all the groups to which the user belongs.

$ id sampleuser
uid=1002(sampleuser) gid=1003(sampleuser) groups=1003(sampleuser)

●Check groups with the groups command
The groups command also requires a user name as an argument

$ groups sampleuser
sampleuser : sampleuser

●Display the group list with the getent command

$ getent group
root:x:0:
bin:x:1:
daemon:x:2:
sys:x:3:
adm:x:4:
tty:x:5:
~中略~
systemd-network:x:192:rpc:x:32:
mysql:x:1009:
centos7:x:1010:
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