This example script for usb mount alert.

#!/bin/bash
#Script - admin@serversignature.com
#usb mount alert
#
FS=/backup/cpbackup/daily/dirs
EMAIL1="admin@serversignature.com"
SUBJECT="Alert $FS not mounted"
TEMPFILE="/tmp/usb-mount"
echo "$SUBJECT" > $TEMPFILE
if [ -d $FS ];then
echo "$FS exists" > /dev/null 2>&1
else
mail -s "$SUBJECT" "$EMAIL1" < $TEMPFILE
mount /dev/sda1 /backup
fi
exit