Security Strategies in Linux Platforms and Applications, 3rd Edition

Securing Groups of Users

Administrators need to be able to set up users in special groups, with dedicated directories. Administrators can give those users rights and privileges on dedicated directories. The noted directories can be shared by groups of workers. Before configuring such groups, you need to understand how the user private group scheme works in Linux.

User Private Group Scheme

Linux users are assigned to at least one group. Typically, the primary group is the same as the username. Your user can also be assigned to multiple other groups. As an example, following, you can see my username and the default group number is 1000. Looking for group number 1000 in the /etc/group file shows the group name as the same name as the user.