AWS EC2 temporarily connect to an instance by id

ec2_connect.sh

#!/bin/sh

# Allows you to temporarily connect to an ec2 instance, using 
# awscli to first push your own key to the instance, then using ssh 
# to log in to the instance.

# Assumes a public key called ec2.pub and a private
# key called ec2.

# Usage ec2_connect.sh i-12345679abcdef <other-user> <other-file>

INSTANCE_ID=$1
SSHUSER=${2:-"ec2-user"}
FILE=${3:-'ec2'}

INSTANCE=$( aws ec2 describe-instances  \
  --instance-ids  $INSTANCE_ID \
  --query 'Reservations[0].Instances[0]' \
)

AZ=$(echo $INSTANCE|jq '.Placement.AvailabilityZone'|sed 's/"//g')
IP=$(echo $INSTANCE|jq '.PrivateIpAddress'|sed 's/"//g')
REGION=$(echo $AZ|rev|cut -c 2-|rev)

aws ec2-instance-connect send-ssh-public-key \
  --region $REGION \
  --availability-zone $AZ \
  --instance-id $INSTANCE_ID \
  --instance-os-user $SSHUSER \
  --ssh-public-key file://${FILE}.pub

ssh -i $FILE ${SSHUSER}@${IP}