This utility will find <Search> string and replace it with <Replacement> string in all files in current folder including their both filename and contents.

renamed.sh

#!/bin/bash

cat <<EOF
This utility will find <Search> string and replace it with <Replacement> string
in all files in current folder including their both filename and contents

EOF

# check if GNU rename utility exists
if [ ! -f /usr/local/bin/rename ]
then
	echo "No GNU rename utility was found. Install it by running:"
	echo "brew install rename"
fi

echo "Enter Search string:"
read FROM

echo "Enter Replacement string:"
read TO

echo "";
echo "Renaming files..."

find . -iname "*${FROM}*" -exec echo "Renaming {}" \; -exec /usr/local/bin/rename s/$FROM/$TO/ {} \;

find . -iname "*.[m,h]" -exec echo "Replacing {}" \; -exec sed -i '' "s/${FROM}/${TO}/g" "{}" \;

echo "Done"

#EOF