stop_instances.sh は，引数に渡したサーバーリスト内の EC2 インスタンスを「順番に」停止します。サーバーリストには Name タグの Value を列挙します。

stop_instances.sh

#!/bin/sh

# Check number of variables.
if [ $# != 1 ]
then
   echo 'Usage:'
   echo './start_instances.sh servers.list'
   exit 255
fi

#
# Variables
#

NUMBER_OF_SERVERS=`cat ${1} | grep "" -c`

# Create variables below
# SERVER_0?
# ID_SERVER_0?
i=1
while read LINE
do
    export SERVER_0${i}=`echo ${LINE}`
    export SERVER_NAME=`eval echo '$'{SERVER_0"$i"}`
    export ID_SERVER_0${i}=`aws ec2 describe-instances --filters "Name=tag-value,Values=${SERVER_NAME}" | jq '.Reservations[].Instances[].InstanceId' | cut -c 2-11`
    let i=i+1
done < ${1}

#
# functions
#

function stop_ec2_instance() {
    IF_STOPPED=`aws ec2 describe-instances --instance-ids ${1} | jq '.Reservations[].Instances[].State[]' | head -1`
    if [ "${IF_RUNNING}" = \"stopped\" ]
    then
        echo ${2} has already stopped.
    else
        aws ec2 stop-instances --instance-ids ${1} 1>/dev/null
        if [ ${?} = 0 ]
        then
            echo stop ${2}.
        else
            echo Some Error Occured in stopping ${2}.
        fi
    fi
}

function check_if_stopped_ec2_instance() {
    # if stopped
    IF_STOPPED=`aws ec2 describe-instances --instance-ids ${1} | jq '.Reservations[].Instances[].State[]' | head -1`
    if [ "${IF_STOPPED}" = \"stopped\" ]
    then
        echo ${2} stopped.
        break
    else
        sleep 5
        echo ${2} is stopping...
    fi
}

#
# main
#

for i in `seq 1 ${NUMBER_OF_SERVERS}`
do
    export INSTANCE_ID=`eval echo '$'{ID_SERVER_0"$i"}`
    export SERVER_NAME=`eval echo '$'{SERVER_0"$i"}`
    stop_ec2_instance ${INSTANCE_ID} ${SERVER_NAME}
    while true
        do
            check_if_stopped_ec2_instance ${INSTANCE_ID} ${SERVER_NAME}
        done
    let i=i+1
done

exit 0