Adding & Managing Users in Linux Groups

In Linux, groups organize users by grouping certain access levels to files and directories. Every user is a member of a primary group by default and can also be added to secondary groups with additional permissions. If a set of Linux users all need the same permissions to specific files and directories, you can add them to a group and set permissions for that group as a whole instead of for each individual user. This wikiHow article will teach you how to add a user to a group, change a user's primary group, and take care of other group-related administrative tasks on a Linux server or workstation.