SSHs to an AWS instance with an ASG hostname

ssh_to

#!/bin/bash

IFS=$'\n'
unsorted_hosts=($(aws ec2 describe-instances --query "Reservations[].Instances[].{Name:Tags[?Key=='Name'].Value|[0]}" --output text --filters "Name=tag:Name,Values=*$1*"))
hosts=($(sort -V <<<"${unsorted_hosts[*]}"))
unset IFS

len=$(expr ${#hosts[@]} - 1)
for i in $(seq 0 $len); do
    id=$(expr $i + 1)
    echo -e "\e[31m[\e[39m$id\e[31m]\e[39m \e[33m${hosts[$i]}\e[39m"
done

echo -en "\n\e[95mSelect host:\e[39m "
read -n 3 input

case $input in
    [1-9]*)
        input=$(expr $input - 1)
        ssh "${hosts[$input]}"
        ;;

    *)
        exit
        ;;
esac