import subprocess

def handler(event, context):
    commands = [
        'whoami',
        'id',
        'df -h',
        'ls -l /mnt',
        'touch /mnt/lambda-efs/dummy.file',
        'ls -l /mnt/lambda-efs/dummy.file'
    ]

    for command in commands:
        output = subprocess.check_output(command.split(' '))
        print(f"Running command '{command}':\n{output.decode('ascii')}\n---\n")

    return {
        'statusCode': 200,
        'body': 'Hello world'
    }