Trivial bash Script to restart services in AWS

Too many aws servers? Been there and I hate it. Following is a simple script that I use to restart services running on EC2 instances. I am using AWS Cli to get the ip address based on tag names and then ssh into the box and to the command. Note that the tag names are the same as service names in my case.

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#!/bin/bash   set -e   function usage {   echo >&2 "Usage: $0 [ -e environment -n service_name -a action ]"   exit 1 }   while getopts ":n:e:a:" FLAG; do   case $FLAG in     n) NAME=${OPTARG};;  e) ENV=${OPTARG};;  a) ACTION=${OPTARG};;  [?]) usage;;   esac done   if [[ -z $NAME || -z $ENV || -z $ACTION ]]; then   usage fi   for fid in $(aws ec2 describe-instances --filters "Name=tag:ServerEnv,Values=${ENV}" "Name=tag:SubSystem,Values=${NAME}" --query 'Reservations[*].Instances[*].PrivateIpAddress' --output text) do  ssh -n $fid "sudo ${ACTION} ${NAME}; exit;" done