The $$ variable is the process id. It will be consistent through the run of
the script. Each invocation of the script will get a different process id.

Brant Evans

On Mon, Feb 16, 2009 at 10:41 PM, Nathan England <nathan@paysonlinux.org>wrote:

>
> 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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