#!/bin/sh

if [ $# -eq 0 ]; then
  parallel -j0 -n1 "$0" < \
    "${0%/*}/hosts" | \
    sort -k1,1
  exit
fi

ssh -o ConnectTimeout=5 "$@" '
  sudo -S pacman -Sy </dev/null >/dev/null 2>&1
  {
    pacman -Qqm
    pacman -Qqdt | sed p
  } | sort | uniq -u
' 2> /dev/null | \
  sed 's|$| '"$@"'|'