Display the files (*.php or *.js) which end with the duplicate new lines under the current directory.

double-new-line.sh

array=$(find . -type d \( -name 'node_modules' -o -name 'vendor' \) -prune -o -type f \( -name '*.js' -o -name '*.php' \) -print)
for a in $array; do
  start=$(expr $(wc -c < $a) - 2)
  [[ $start -lt 0 ]] && continue
  new_line=$(hexdump -s $start $a | cut -c 9-13)
  [[ $new_line = '0a 0a' ]] && echo "$a: $new_line"
done