Given a few parameters connect to a set of ec2 instances, one per tmux pane

connect.sh

#!/bin/bash
SSH_KEY=
USERNAME=

usage() { echo "Usage: $0 -s <tmux_session_name> [-k <my_ssh_key.pem>] [-u <username>] <host> <host1> ..." 1>&2; exit 1; }

while getopts "s:k:u:" option;
do
    case "${option}" in
        s) SESSION_NAME=${OPTARG};;
        k) SSH_KEY=${OPTARG};;
        u) USERNAME=${OPTARG};;
        *) usage;;
    esac
done

if [[ "$SESSION_NAME" == "" ]]; then
    usage
fi

if [[ "$SSH_KEY" == "" ]]; then
    SSH_KEY_PART=
else
    SSH_KEY_PART="-i $SSH_KEY"
fi

if [[ "$USERNAME" == "" ]]; then
    USERNAME_PART=
else
    USERNAME_PART="$USERNAME@"
fi

shift $((OPTIND-1))
HOSTS=($@)



tmux new -d -s $SESSION_NAME
for index in ${!HOSTS[*]}
do
    if [[ "$index" == "0" ]]; then
        continue
    fi
    tmux split-window -t $SESSION_NAME.0 -h
done
tmux select-layout -t $SESSION_NAME even-horizontal
for index in ${!HOSTS[*]}
do
    host=${HOSTS[$index]}
    tmux send -l -t $SESSION_NAME.$index "ssh $SSH_KEY_PART $USERNAME_PART$host"
done
tmux attach -t $SESSION_NAME