Website UP or DOWN checker

isup.sh

#!/bin/bash

# check every 10 seconds if a website is up or down

WEBSITE=$1

while true; do
	#curl downloads only HTTP header in silent mode
	#head gets the first line 
	#grep searches for HTTP 200 OK status code and outputs the number of lines found
	
	STATUSCODE=`curl -s --head $WEBSITE | head -n 1`
	if [ `echo $STATUSCODE | grep 200 -c` == 1 ]
	then
		echo -n `date "+%Y-%m-%d %H:%M:%S"`
		echo " UP"
	else
		echo -n `date "+%Y-%m-%d %H:%M:%S"`
		echo " DOWN - ERROR $STATUSCODE"
	fi

sleep 10;
done;