#! /bin/sh

cmd=${1%% *}
args=${1#* }
case $cmd in
    calc)
        printf "%s = " "$args"
        printf "%s\n" "$args" | bc -l
        ;;
    units)
	src=${args% ->*}
	dst=${args#*-> }
        units -1 -v -- "$src" "$dst"
        ;;
    *)
        exit 1
        ;;
esac