rreplace

#!/bin/bash
if [ "$#" -lt 3 ]
then 
	echo "Usage: $0 <filepattern> <searchterm> <replaceterm>"
	echo "where <filepattern> is pattern of file to be scanned"
	echo "      <searchterm> is the pattern of the string to be found"
	echo "      <replaceterm> is the string that will replace <searchterm>"
	exit 1
fi

echo "Recursively replacing '$2' with '$3' in '$1' files..."
find . -iname "$1" -print0 | xargs -0 sed -i '.bak' "s^$2^$3^g"