Is there any way to make it work without selecting text? (default to all available text on the textarea)

BTW, I changed a few things: emacsclient path and the tmp folder:

  tmp=$(mktemp "/tmp/EditTextinEmacsXXXXXXXX")
  ec=/usr/local/bin/emacsclient
  cat > "$tmp"
  until [ $($ec -q -e '(server-running-p)' 2>/dev/null) == t ]; do
    sleep 1
  done
  $ec -q -c "$tmp"
  rv="$?"
  cat "$tmp"
  if [ $rv -ne 0 ]; then
    echo "Something went wrong.  Please find your text in"
    echo "$tmp"
  else
    rm "$tmp"
  fi