A script to remind you if you've left instances running

mail-ec2-report.bash

#!/bin/bash
#
# mail-ec2-report.bash - A script to remind you if you've left instances running

# You must set this:
EMAIL="foo@example.com" # email address (or list of email addresses) to send message to 

# You may want to set these:
#REGIONS="" # By default, generates a report for every region
#MAIL="mail" # Mail program to use. Maybe try: https://github.com/oldpatricka/maul

## End of config options

if [ -z "$REGIONS" ]; then
    REGIONS=`ec2-describe-regions | awk '{print $2}'`
fi

if [ -z "$MAIL" ]; then
    MAIL="mail"
fi

message=""

for REGION in $REGIONS ; do

    instances=`ec2-describe-instances --region ${REGION} | grep INSTANCE | wc -l`
    if [[ $instances -gt 0 ]]; then
        message="${REGION}: ${instances} running\n${message}"
    fi
done

if [ -n "$message" ]; then
    printf "$message" | $MAIL -s "Instances running on EC2" $EMAIL
fi