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Date: Tue, 12 Feb 2013 08:53:37 -0600
From: Tim Daneliuk <tundra@tundraware.com>
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Subject: Was I Sourced?
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Is there a way for script to determine whether is was sourced
or forked off as a subprocess when it was invoked?

I have a script that needs to be sourced to work properly and
I want to warn the luser if they exec or subshell it instead.

TIA,
-- 
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Tim Daneliuk