whenup

#!/bin/bash

if [ $# -lt 1 ]; then
  echo "Usage: $0 [-a] <host>"
  exit 1
fi

if [ "$1" == '-a' ]; then
  alertme=yes
  shift
fi

host="$1"
shift

up=
case "$OSTYPE" in
  solaris*) ping -s "$host" | tailfgrep -q 'bytes from' && up=yes
            ;;

  # FreeBSD and Linux
         *) ping "$host" | tailfgrep -q 'bytes from' && up=yes
            ;; 
esac

if [ -n "$up" ]; then
  if [ -n "$alertme" ]; then
    alertme "$host is pingable" >&/dev/null
  fi
  exit 0
else
  exit 1
fi