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Howto restrict su command to superuser only in Linux

Posted 08-26-2007 at 11:51 AM by sridhar11
Updated 06-17-2016 at 10:05 AM by sridhar11

su is run a shell with substitute user and group IDs. su is used to become another user during a login session. Invoked without a username, su defaults to becoming the super user. The optional argument - may be used to provide an environment similar to what the user would expect had the user logged in directly.

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