change environment variable via script

[Victor Odhner]

Another solution is to source your script into the current shell by 
"dotting" it.

. ./script.sh

That runs script.sh in the current shell, so everything it does remains 
part of your environment.
It's especially useful in ad hoc situations where you don't want to 
modify your .profile.
And of course you can also use this approach to add the function to your 
environment
only when you need it.

Be careful not to put an "exit" in the "dotted" script, since that will 
end your session.

Vic