BASH scripting

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~(-:
---------------------------------------------------
PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org
To subscribe, unsubscribe, or to change your mail settings:
http://lists.phxlinux.org/mailman/listinfo/plug-discuss