How do I remove a user from a group on Red Hat Enterprise Linux?

Solution Unverified - Updated -

Issue

  • I'm just curious how to roll back from the following command command?
# usermod -G root zabbix

Environment

  • Red Hat Enterprise Linux (RHEL), including
    • Red Hat Enterprise Linux 4 (RHEL4)
    • Red Hat Enterprise Linux 5 (RHEL5)
    • Red Hat Enterprise Linux 6 (RHEL6)
  • A user in one or more secondary groups. For example, the following user is in the "root" secondary group:
$ groups testuser
testuser : testuser root

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