#!/bin/sh
set -euf

usage() {
  echo 'untiport $target $port'
  echo 'Sleeps until the destinated port is reachable.'
  echo 'ex: untilport google.de 80 && echo 'google is now reachable''
}

if [ $# -ne 2 ]; then
  usage
else
  until nc -z "$@"; do sleep 1; done
fi