Linux: Find Out The Groups A User Is In

How do I find out group membership for each user? How do I find out which users are in a group called sales?

The groups command display the groups a user is in. In this example, find out the group membership for user vivek, enter:

 groups userName
 groups vivek

groups userName
groups vivek

Sample outputs:

vivek : vivek adm dialout cdrom plugdev lpadmin netdev admin sambashare libvirtd

User vivek is member all of the above groups. Find out all users belongs to the group called adm:

grep -w groupName /etc/group
grep -w adm /etc/group

grep -w groupName /etc/group
grep -w adm /etc/group

Sample outputs:

adm:x:4:vivek,top,jerry

See also:

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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