Every user on a Linux system belongs to at least one group, call primary group. However, users can belong to many groups. Groups are used to organize users.For example:
If members of the Front-end team need to access to some of the same files and directories, they can be placed in to the frontend group.
The groups command (
You can run the
groups command to displays what groups you are a member of. You can also use
id -Gn, as a synonym for groups and it will give the same output.
$ groups staff everyone admin $ id -Gn staff everyone admin
If you supply another user's ID to an argument to the group's command. You will see a list of groups to which that user belongs.
$ groups john staff sales
Working with Groups
If you are a member of multiple groups, then when you create a new file it will be in the primary group ( first group ) . If you would like to change the group of the file, use the
Here is an example that the test.txt file was created and put in my primary group , which is staff. I am also the member of the everyone and admin groups.
$ ls -l test.txt -rw-r--r--@ 1 robin staff 411 16 Sep 22:50 test.txt $ groups staff everyone admin
So, to change the group to everyone for this file, you can type the command
chgrp everyone test.txt.
$ chgrp everyone test.txt $ ls -l test.txt -rw-r--r--@ 1 robin everyone 411 16 Sep 22:50 test.txt
Then you can give the permissions in the everyone group can edit the file.
$ chmod g+w test.txt $ ls -l test.txt -rw-rw-r--@ 1 robin everyone 411 16 Sep 22:50 test.txt
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