bash file to refactor (find and replace)

refactor

#!/bin/bash
##

if [ $# -lt 2 ]
	then
	echo "usage $0 <old> <new>"
	exit -1
fi

old=$1
new=$2

#find in files
files=`grep -HR $old * |grep -v 'Binary file'| cut -d':' -f 1|sort|uniq`
for f in $files
do
	file $f >/dev/null
	if [ $? == 0 ]
	then
		echo "processing $f"
		sed -i s/$old/$new/g $f
	fi
done

# find files with same name and rename files
for f in `find ./ -name $old`
do
	newfile=`dirname $f`/$new
	echo "Renaming $f to $newfile"
	mv $f $newfile

done

echo "done"