def main():

    args = parse_args()

    try:
        boto3.setup_default_session(profile_name=args.profile, region_name=args.region)
        conn = boto3.client('ec2')
    except ProfileNotFound as e:
        print(e)
        sys.exit(1)

    # Retrieve a list of instances that match the filters
    reservations = conn.describe_instances(Filters=get_filters(args))
    if len(reservations['Reservations']) == 0:
        print('No instances matching criteria')
        sys.exit(1)

    instance_dns_names = [[
        instance['PublicDnsName'] for instance in reservation['Instances']][0]
        for reservation
        in reservations['Reservations']]
    if args.all_matching_instances:
        pass
    else:
        # Pick a random instance from the results
        instance_dns_names = [instance_dns_names[random.randrange(0, len(instance_dns_names))]]

    if args.command:
        remote_command = ' '.join(args.command)
    else:
        remote_command = ''

    for dns_name in instance_dns_names:
        if args.ssh_user:
            dns_name = '%s@%s' % (args.ssh_user, dns_name)

        ssh_cmd = 'ssh %s %s %s' % (args.ssh_args, dns_name, remote_command)
        os.system(ssh_cmd)
dataset/ETHPy150Open mikery/ssh2ec2/ssh2ec2/__init__.py/main/original