Renames everything (filenames and file contents) recursively inside a folder

rename.sh

#!/bin/bash
forbidden_extensions=( "jpg" "jpeg" "png" "gif" "swf" "svg" )

# Usage: includes 'blabla' $arr
includes () {
  local e
  for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
  return 1
}

rename() {
  for entity in "$1"/*; do

    dir="$(dirname "$entity")"
    base="$(basename "$entity")"
    new_name="$dir/${base/my-old-name/my-new-name}"

    if [ ! "$entity" = "$new_name" ]; then
      mv "$entity" "$new_name"
    fi

    if includes "${new_name##*.}" "${forbidden_extensions[@]}"; then
      echo "FILE IS FORBIDDEN:" "${new_name}"
    fi

    if [[ -d "$new_name" ]]; then
      rename "$new_name"
    elif [[ -f "$new_name" ]]; then
      if includes "${new_name##*.}" "${forbidden_extensions[@]}"; then
        echo "FILE IS FORBIDDEN:" "${new_name}"
      else
        sed -i '' 's/my-old-name/my-new-name/g' "$new_name"
      fi
    fi
  done
}

# rename everything inside ./my-dir
rename ./my-dir