just starting with this so please, bear with me....

Anyways I am looking at this beginner's script:

   #! /bin/bash

   myvar=0

   while [ $myvar -ne 20 ]

   do

           echo $myvar

           myvar=$(( $myvar + 1 ))

   done

Now my mind can wrap itself around everything in this script except for tis line:

  

   myvar=$(( $myvar + 1 ))

Where my difficulty arises is why the '$' before the '(('?

(it was geast fun running that script with a minus sign instead!)

:-)~MIKE~(-:

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