text: #!/usr/bin/env python
  """
  Install our application on a remote machine.
  
  Usage:
      install_app.py <hostname>
  
  Where:
      <hostname>  Hostname to install to.
  """
  import os
  import sys
  
  import mitogen
  
  
  def install_app():
      os.system('tar zxvf my_app.tar.gz')
  
  
  @mitogen.main()
  def main(router):
      if len(sys.argv) != 2:
          print(__doc__)
          sys.exit(1)
  
      context = router.ssh(hostname=sys.argv[1])
      context.call(install_app)
  