SQL*Plus: can variables be used for control of execution?

I run Oracle v.8.1.7, and I am making a script to be run in SQL*Plus several times.
This script should be run by one specific user logged on, and I would like to add some functionality to check whether the person starting the script is logged on as the user I want her to be, otherwise do not run the commands.

It seems to be possible to use variables in SQL*Plus scripts, so I can probably put the name of the current user into a variable. But I would like to terminate the script (EXIT) if the content of that variable is not identical to one specific value - something like: IF VAR1 <> 'SUP'
 EXIT;
ELSE
.
.

Is it possible in any way to get this functionality into a SQL*Plus script?

Thanks for any help on this,
Randi W Received on Tue Mar 30 2004 - 02:20:57 CST