Look up expressions in man bash.

Brian wrote:
> 
> Thank you all very much for your help.  I should have made one thing
> clearer, though.  The data file is not always numeric, some lines look
> like:
> 
> 0100My name is Jim
> 
> > strip=${six//0}
> 
> What exactly does this line do?  How do get the man page for it?
> 
> Thanks a lot, the info I've gotten helps me immensely.
> 
> -Brian
> 
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