gistfile1.txt

#!/bin/bash

debug() {
:;
#       echo $* 1>&2
}

ADD_X=$2
ADD_Y=$3

cat $1 | while read line; do
        debug line $line
        set $line
        ignore=true
        for i in $(seq 1 $#); do
                param=${!i}
                firstchar=${param:0:1}
                case "$firstchar" in
                X | Y )
                        value=${param:1}
                        debug "value $value"
                        echo -en $firstchar
                        addvar="ADD_${firstchar}"
                        debug "nuline-2 $nuline"
                        debug "add ${!addvar}"
                        echo -en $(echo "scale=4; $value + ${!addvar}" | bc)
                        debug "nuline-1 $nuline"
                        ;;      
                M)
                        echo -en "(${!i})"
                        ;;
                *)      
                        echo -en ${!i}
                        ;;      
                esac
                echo -en " "
        done;
        echo
done