#!/bin/sh

# start or stop
CMD=$1

INSTANCES_LIST=instances.txt

# list all instance-ids
aws ec2 describe-instances | jq '.Reservations[].Instances[].InstanceId' > $INSTANCES_LIST

# stop all instances
INSTANCE_IDS=`tr '¥n' ' ' < $INSTANCES_LIST | sed s/\"//g`
aws ec2 $CMD-instances --instance-ids $INSTANCE_IDS

rm -f $INSTANCES_LIST