ping.sh

#! /bin/bash

if [ -e /tmp/ping-test.pid ]
then
    echo "script already running"
    exit 1;
fi

PID=$$
HOST=$1
COUNTER=0

echo $PID >> /tmp/ping-test.pid

while [ $COUNTER -lt 5 ];
do
    let COUNTER+=1
    ping -c1 $HOST
    if [ $? -eq 0 ]
    then 
        echo "OK"
        rm /tmp/ping-test.pid
        exit 0
    else
        echo "ERROR"
        sleep 1
    fi
done

echo "FAIL"
rm /tmp/ping-test.pid
exit 1