I would like to pipe a file of numbers (one per line) to "bc" and have it run a function
like :
(( $input * 0.123 / 0.321 ) + 13 )

and spit all that back out to another file, can anyone help me with that syntax, I
want to do something like (I know this wont't work)

cat inputfilename | bc (( $input * 0.123 / 0.321 ) + 13 ) > outputfilename


regards,
....Mitch