#!/bin/bash

upd() {
  checkupdates | wc -l > /tmp/checkupdates
}

if [[ ! -f /tmp/checkupdates ]]; then
  upd
fi

count=$(cat /tmp/checkupdates)
status="$count updates"
if [[ $count -eq 0 ]]; then
  status="Up to date"
elif [[ $count == "1" ]]; then
  status="$count update"
fi
echo "$status"

upd & disown