Linux Command - newgrp

The Linux command newgrp can be used to change the primary group membership of a user for a session.

• Need to be a member of the group or have the password for that group.

Change primary group membership to this group:

newgrp  group1

Reinitialize env as if user just logged in ( using a dash ):

newgrp - group1

Reset primary group to users default group:

newgrp