Simple Bash/Posix find and replace shell script. This script is dangerous and will perform a recursive in-place modification of every file forward of the provided directory. Binary files, hidden files, etc. Use with caution.

find-replace.sh

#!/bin/bash                                                                                                                                                                                                                                

die () {
  echo >&2 "$@"
  exit 1
}

[ "$#" -eq 3 ] || die "3 arguments required ('find', 'replace', dir), $# provided"

MATCH=$1
REPLACE=$2
DIR=$3

echo "Replacing $MATCH with $REPLACE recursively in $DIR with files:"
grep -r --color $MATCH $DIR

echo ""
read -p "Are you sure? [y/n]" -n 1 -r

echo ""

if [[ $REPLY =~ ^[Yy]$ ]]
then
  find $DIR -type f -print0 | xargs -0 sed -i s/$MATCH/$REPLACE/g
  echo "Replace complete"
else
  echo "Aborted find/replace due to confirmation failure."
fi