#!/bin/bash

original=(a b c d)
replacement=(w x y z)

# Test that we have both arguments
if [ -z "$1" ]; then
	echo Usage: replace_words ORIGINAL REPLACEMENT
	exit
fi

for ((i=0;i<1;i++));
do

	orig=${original[$i]}
	repl=${replacement[$i]}
	echo $orig to $repl
	for filename in `find $1 -name '*.[ch]'`
	do
		sed -i -e "s/$orig/$repl/g" $filename
	done
done