Example of a simple uptime checking script using sites in InfiniteWP database

iwp_uptime.sh

#!/bin/bash

# Database configuration

DBNAME=""
DBUSER=""
DBPASS=""

# Email configuration

TO=""
FROM=""
SUBJECT=""

# Processing

QUERY="SELECT URL FROM iwp_sites ORDER BY RAND()"
SITES=$( echo $QUERY | mysql $DBNAME -u $DBUSER -p$DBPASS --skip-column-names )
for SITE in $SITES; do
	CODE=$( curl -iskL $SITE | grep "HTTP/" | tail -n 1 | cut -d$' ' -f2 )
	if [ "$CODE" -ge 400 ] || [ "$CODE" -eq 0 ]; then
		echo "$SITE appears to be offline" | mail -S from="$FROM" -s "$SUBJECT" "$TO"
	fi
done