A bash function that takes file extensions as arguments. You may pass as many as you want and output each file name matching your extension into a file so you can copy and past from it quickly or share your custom file list

filelist.sh

filelist() {

  if [ $# -gt 0 ]; then
    shopt -s nullglob
    for ext in "$@"; do
      printf '%s\n' *.$ext
    done | pbcopy
    echo "copied listing for $@ files to clipboard"
  else
   shopt -s nullglob
  for ext in *.*; do
    echo "$ext"
  done | pbcopy
    echo "copied listing for all files to clipboard"
  fi

}