> A ":" on it's own will do what you want.
>
>   if [ "$remaining" = "" ]
>   then
>     :
>   else
>     kill -9 $remaining
>   fi
>
> But better would be
>
>   if [ -n "$remaining" ]
>   then
>     kill -9 $remaining
>   fi
>
>   

thanks to all for the suggestions
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