I have sudo configured on the servers around our office to send me administrative notes when someone invokes sudo without having permission to do so.

So I get a message (where YYYYYY is the server name and ZZZZZZ is the username):

  YYYYYY: Aug 23 15:41:32 : ZZZZZZ : user NOT in sudoers ;
  TTY=pts/1 ; PWD=/home/ZZZZZZ ; USER=root ; COMMAND=/bin/ls

sudo let the user in question that his activity would be recorded and reported, so just a few seconds later I get another warning:

  YYYYYY: Aug 23 15:41:46 : ZZZZZZ : user NOT in sudoers ; TTY=pts/1 ;
  PWD=/home/ZZZZZZ ; USER=root ; COMMAND=/bin/echo Just checking

:-)

--
Paul Heinlein
[email protected]
45°38' N, 122°6' W

---------- Forwarded message ----------
Date: Thu, 23 Aug 2012 15:41:47 -0700
From: [email protected]
To: [email protected]
Subject: *** SECURITY information for gibson.galois.com ***

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