Very Computer

1. Prevention of multiple access via telnet, rlogin, etc.

Add a check to /etc/profile to see if the user is logged in more than once,
and if they are, log them out.

Something like:

if [ `w -h $LOGNAME | wc -l` -gt 1 ]; then
   echo "Sorry, you can only be logged in once." >&2
   sleep 3
   exit 1
fi

I am trying to develop a script that will prevent certain users from
logging in multiple times to any of the UNIX systems at our facility.
My only solution thus far is to create a file that will be "given" to the
user upon login.  Thus, since the file can only be received once,
users can only perform a remote login one time to any given system.

I am primarily interested in feedbacks regarding feasibility and any
drawbacks.  However, any script would also be greatly appreciated.

Thanx.

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