In Linux Operating System, Every user is a member of one or more groups. And these files and directories are owned by the group.
This is known as their “group ownership”.
So to list the group ownership of your files use the below command:
And also if you want to change the group ownership of a file or directory then use the this command:
#chgrp (group_name) (file/directory_name)
Exa: #chgrp 300 /expertisenpuru