AWS EC2 Stop/Start BASH script for end users to run on Linux or Mac

You must first provision an IAM user with permissions to perform the action:

{

    "Version": "2012-10-17",

    "Statement": [

        {

            "Effect": "Allow",

            "Action": [

                "ec2:StartInstances",

                "ec2:StopInstances",

            ],

            "Resource": [

                "arn:aws:ec2:us-east-1:<account number>:instance/i-1234567890"

            ]

        }

    ]

}

Configure the AWS CLI with the above IAM user on the end users local computer.

When they run the script, they will need to specify one of three options: status, start, or stop 

If writing this script in Windows, and trying to test in WSL or an actual Unix based system, then you might get this error:

'\r': command not found

Use "dos2unix" on the script file after each edit to modify the newline characters so they are Unix compatible [1].

Modified from source [2]

#!/bin/bash

INSTANCE_ID="i-1234567890"

function _log(){

    trailbefore=$2

    start=""

    if [ -z $trailbefore ] || [ $trailbefore = true ]

        then

        start=" - "

    fi

    printf "$start$1"

}

function run_command (){

    COMMAND=$1

    # note in the original parameter count as new parameter

    QUERY="$2 $3"

    OUTPUT="--output text"

    local result=$(eval aws ec2 $COMMAND --instance-ids $INSTANCE_ID $QUERY $OUTPUT)

    echo "$result"

}

function getStatus(){

    CMD="describe-instances"

    EXTRA="--query \"Reservations[].Instances[].State[].Name\""

    result=$(run_command $CMD $EXTRA)

    echo $result

}

function _checkStatus(){

    status=$(getStatus)

    if [ $status = "pending" ] || [ $status = "stopping" ]

        then

        _log "Current status: $status"

        _log " Wating "

        while [ $status = "pending" ] || [ $status = "stopping" ]

            do

            sleep 5

            _log "." false

            status=$(getStatus)

        done

        _log "\n" false

    fi

}

function start {

    CMD="start-instances"

    _checkStatus

    result=$(run_command $CMD)

    echo $result

}

function stop {

    CMD="stop-instances"

    _checkStatus

    result=$(run_command $CMD)

    echo $result

}

if [ -z "$1" ]

    then

    _log "\n Possible commands: status|start|stop \n\n"

else

    if [ $1 = "start" ] 

        then

        start

    elif [ $1 = "stop" ] 

        then

        stop

    elif [ $1 = "status" ] 

        then

        getStatus   

    fi

fi

[1] https://stackoverflow.com/questions/11616835/r-command-not-found-bashrc-bash-profile

[2] https://stackoverflow.com/questions/42641970/aws-cli-bash-script-to-manage-instances