Because you are assigning the variable result of the executed expression.
On Mon, Mar 2, 2015 at 6:36 PM, Michael Havens <[email protected]> wrote:
> 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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