import sys
from fabric.api import *

env.hosts = ['ip']
env.user = 'root'
env.key_filename = "/path/vpskey.pem"
env.user = sys.argv[1]

def task():
    with cd("/path"):
	run('command')


def main():
        execute(task)


        return 0

if __name__ == '__main__':
        main()