Primary and secondary groups on Linux

There are two types of groups — primary and secondary.

The primary group is the one that's recorded in the /etc/passwd file,
configured when an account is set up. When a user creates a file, it's
their primary group that is associated with it.

Secondary groups are those that users might be added to once they
already have accounts. Secondary group memberships show up in the
/etc/group file.


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