Stop or Start (and SSH to) EC2 instance

ec2StopStart.sh

#!/bin/bash

# Set variables for tags, region, SSH key location & user
# Set these 4 to appropriate values
REGION="eu-central-1"
TAG="chris-sandbox"
SSH="~/.ssh/frankfurt.pem"
USER="ubuntu"

# Check AWS credentials exist
if [[ $(aws configure list | grep "*") && $? -eq 0 ]]; then
 :
else
  echo "Please configure AWS credentials to continue..."
   exit 0
fi

# Get instance ID
ID="$(aws ec2 --region $REGION describe-instances --filters "Name=tag:Name,Values=$TAG" --query Reservations[].Instances[].InstanceId --output=text)"

## Functions
# State of instance
STATE () {
  aws ec2 --region $REGION describe-instances --filters "Name=tag:Name,Values=$TAG" --query Reservations[].Instances[].State[].Name --output=text
}

# Get Public IP of instance
PUBLIC_IP () {
  aws ec2 --region $REGION describe-instances --filters "Name=tag:Name,Values=$TAG" --query Reservations[].Instances[].NetworkInterfaces[].Association[].PublicIp --output=text
}
##

# Stop instance if running
if [ "$(STATE)" = "running" ]; then
    echo "$TAG" "Stopping..."
    aws ec2 stop-instances --instance-ids "$ID" --region "$REGION" > /dev/null 2>&1
    while [ "$(STATE)" != "stopped" ]; do
        sleep 5
    done
    echo "$TAG" "Stopped!"
else
  # Start instance if stopped
    echo "$TAG" "Starting..."
    aws ec2 start-instances --instance-ids "$ID" --region "$REGION" > /dev/null 2>&1
    while [ "$(STATE)" != "running" ]; do
        sleep 2
    done
    echo "$TAG" "Started..."
    echo "Logging into instance"
    # Get Public IP
    PUBLIC_IP > /dev/null 2>&1
    # SSH into instance
    until ssh -qi ssh -i "$SSH" "$USER"@"$(PUBLIC_IP)"
    do
      sleep 1
      done
fi