Script to Set Environment Variable?

[ms419]

How do I write a script to set an environment variable?
I feel like I should know this. I want to set my PATH in pbuilder & the 
author suggested using an "A" hook. However, I can't create a hook - an 
executable - which sets an environment variable.

I tried:
        #!/bin/sh
        export PATH=/usr/lib/ccache:$PATH
and just:
        export PATH=/usr/lib/ccache:$PATH
but in either case, calling ./A10hook doesn't change my environment 
variable. I hope I'm just missing something foolishly obvious.

Thanks for any help!
Jack
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