Changing environment variables in a shell script?

[Chuk Goodin]

I'd like to change an environment variable by running a script and then have 
it stay changed after the script has stopped running. My script is very 
simple:

#!/bin/bash
DISPLAY=opal:1
export DISPLAY

After running it, my DISPLAY variable is unchanged. If I just type the last 
two lines (one at a time) into the command prompt, it works. Also, if I 
check the DISPLAY variable from within the script, it shows up as what I 
want it to be. How do I get it to change my "main" environment variable?

thanks in advance,


-- 
chuk
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