Replace text function for shell

text_replace.sh

function text_replace() {
  case "${OSTYPE}" in
    darwin*)  PLATFORM="OSX" ;;
    linux*)   PLATFORM="LINUX" ;;
    bsd*)     PLATFORM="BSD" ;;
    *)        PLATFORM="UNKNOWN" ;;
  esac

  if [[ "${PLATFORM}" == "OSX" || "${PLATFORM}" == "BSD" ]]; then
    find $1 -type f -name $2 -exec sed -i "" "s/$3/$4/g" {} +
  else
    find $1 -type f -name $2 -exec sed -i "s/$3/$4/g" {} +
  fi
}