How do I prevent a specific user from being able to 'su'?
Issue
On occasion it is necessary to be able to prevent specific users from being able to carry out one or other of the following:
1. Prevent a certain user from performing an su
at all.
2. Prevent a certain user from carrying out an su
to a specific destination user.
Environment
Red Hat Enterprise Linux (RHEL) 5
Red Hat Enterprise Linux (RHEL) 6
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