shell question

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Author: Nathan England
Date:  
To: Main PLUG discussion list
Subject: shell question

Hello Hello,

    I am looking for an explanation of what '$$' is in bash.
I can create a file or a directory, assign it to variables, but how much can I 
do before it changes, or what causes it to change?


What exactly does it mean? Searching google for '$$' returns nothing useful.

Nathan
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