That is non-standard. For example: Code: $ count=3 $ ((spaces=40-count)) $ printf ":%s:\n" "$spaces" :: $ spaces=$((40 - $count)) $ printf ":%s:\n" "$spaces" :37:
$ count=3 $ ((spaces=40-count)) $ printf ":%s:\n" "$spaces" :: $ spaces=$((40 - $count)) $ printf ":%s:\n" "$spaces" :37: