uptime_check.sh

#!/bin/bash

NOTIFYEMAIL="you@gmail.com"

check_ip() {
  s=0
  for i in {1..20}
  do
    r=$( hping3 -c 1 -S -p $2 $1 |& grep "packet loss" | cut -d " " -f 7 | rev | cut -c 2- | rev )
    s=$((s+$r))
  done
  s=$((s/20))

  if [ $s -gt 85 ]
  then
    echo "Server down! IP: $1 Loss: $s%"
    echo "$s% packet loss" | mail -a "From: Watcher <watcher@yourdomain.com>" -s "Server Down: $1" $NOTIFYEMAIL
  else
    echo "Server up! IP: $1 Loss: $s%"
  fi
}

check_ip 1.2.3.4 22
check_ip 10.20.30.40 22