Added word replace tool

tools/replace_words

@@ -0,0 +1,22 @@
+#!/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