title: using ssh in script (w/ expect or paramiko) not working as expected
body: <p>I'm new to Python</p>
  
  <p>I want to write <code>Python</code> script to reboot machine using <code>SSH</code>
  this is my function :</p>
  
  <pre><code>def sendCommandViaSSH(usr,psswrd,command):
      line = 'ssh '+ usr +'@'+ RIp + ' ' +"\""+ command+"\""
      print_message(line)
      child = pexpect.spawn (line)
      #i = child.expect('Are you sure you want to continue connecting (yes/no)?')
      i = child.expect (['Are you sure you want to continue connecting (yes/no)?', pexpect.EOF, pexpect.TIMEOUT],2)
      print_message(i)
      if i == 0:
          child.sendline ('yes')
      i = child.expect(['s password:', pexpect.EOF, pexpect.TIMEOUT])
      print_message(i)
      if i == 0:
          print_message(psswrd)
          child.sendline (psswrd)
  </code></pre>
  
  <p>My problem is that is not working
  If I run the same command manually everything working well</p>
  
  <p>example output:</p>
  
  <pre><code>ssh MyUsr@XXX.XXX.XXX.XXX "shutdown -k now"
  2
  0
  MyPsswrd
  </code></pre>
  
  <p><strong>If I just copy/paste from output it works</strong>
  my machine and my remote are both <code>RedHat6.4</code>
  it is without any security changes that I know of</p>
  
  <p>what is the problem or what other way this can be done ?</p>
  
  <hr>
  
  <p><strong>EDIT:</strong>
  After reading the comments I've moved (back) to use <code>paramiko_1.17.1 module</code>
  <strong>but ... problem persists</strong></p>
  
  <p>below : </p>
  
  <pre><code>1.code that i wrote so far
  2.output that I get using it (while encountering the same problem of not working commands )
  </code></pre>
  
  <p><strong>here is my new code :</strong></p>
  
  <pre><code>import paramiko
  import logging
  logging.basicConfig(level=logging.DEBUG)
  
  def exec_paramiko(ssh, command):
      print_message("executing '{0}' on remote machine".format(command))
      chan = ssh.get_transport().open_session()
      chan.get_pty()
      f = chan.makefile()
      chan.exec_command(command)
      flag=True
      exit_code=None
      output=""
      while True:
          if chan.recv_ready():
              output+=(chan.recv(4096).decode('ascii') + "\n")
          if chan.recv_stderr_ready():
              output+=("error: {0}".format(chan.recv_stderr(4096).decode('ascii')))
          if chan.exit_status_ready():
              output+=(chan.recv(4096).decode('ascii') + "\n")
              error_string=0
              if chan.recv_stderr_ready():
                  error_string=chan.recv_stderr(4096).decode('ascii')
              exit_code = chan.recv_exit_status()
              if exit_code != 0:
                  output+="\nerror: {0}".format(error_string)
              break
      return exit_code, output
  
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  ssh.connect(hostname="10.xx.xx.xx",username="usr",password="psswrd",allow_agent=False,look_for_keys=False, timeout=20)
  exit_code, output = exec_paramiko(ssh,'shutdown -k now' )
  print "error code: {0} message: {1}".format(exit_code, output)
  </code></pre>
  
  <hr>
  
  <p><strong>output :</strong></p>
  
  <pre><code>DEBUG:paramiko.transport:starting thread (client mode): 0xdb17c310L
  DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_1.17.1
  DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-OpenSSH_5.3
  INFO:paramiko.transport:Connected (version 2.0, client OpenSSH_5.3)
  DEBUG:paramiko.transport:kex algos:[u'diffie-hellman-group-exchange-sha256', u'diffie-hellman-group-exchange-sha1', u'diffie-hellman-group14-sha1', u'diffie-hellman-group1-sha1'] server key:[u'ssh-rsa', u'ssh-dss'] client encrypt:[u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'arcfour256', u'arcfour128', u'aes128-cbc', u'3des-cbc', u'blowfish-cbc', u'cast128-cbc', u'aes192-cbc', u'aes256-cbc', u'arcfour', u'rijndael-cbc@lysator.liu.se'] server encrypt:[u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'arcfour256', u'arcfour128', u'aes128-cbc', u'3des-cbc', u'blowfish-cbc', u'cast128-cbc', u'aes192-cbc', u'aes256-cbc', u'arcfour', u'rijndael-cbc@lysator.liu.se'] client mac:[u'hmac-md5', u'hmac-sha1', u'umac-64@openssh.com', u'hmac-ripemd160', u'hmac-ripemd160@openssh.com', u'hmac-sha1-96', u'hmac-md5-96'] server mac:[u'hmac-md5', u'hmac-sha1', u'umac-64@openssh.com', u'hmac-ripemd160', u'hmac-ripemd160@openssh.com', u'hmac-sha1-96', u'hmac-md5-96'] client compress:[u'none', u'zlib@openssh.com'] server compress:[u'none', u'zlib@openssh.com'] client lang:[u''] server lang:[u''] kex follows?False
  DEBUG:paramiko.transport:Kex agreed: diffie-hellman-group1-sha1
  DEBUG:paramiko.transport:Cipher agreed: aes128-ctr
  DEBUG:paramiko.transport:MAC agreed: hmac-md5
  DEBUG:paramiko.transport:Compression agreed: none
  DEBUG:paramiko.transport:kex engine KexGroup1 specified hash_algo &lt;built-in function openssl_sha1&gt;
  DEBUG:paramiko.transport:Switch to new keys ...
  DEBUG:paramiko.transport:Adding ssh-rsa host key for xx.xx.xx.xx: 0c13035c7e4c0e3999d1c85215e97394
  DEBUG:paramiko.transport:userauth is OK
  INFO:paramiko.transport:Authentication (password) successful!
  DEBUG:paramiko.transport:[chan 0] Max packet in: 32768 bytes
  DEBUG:paramiko.transport:[chan 0] Max packet out: 32768 bytes
  DEBUG:paramiko.transport:Secsh channel 0 opened.
  DEBUG:paramiko.transport:[chan 0] Sesch channel 0 request ok
  INFO:paramiko.transport.sftp:[chan 0] Opened sftp connection (server version 3)
  shutting down
  executing 'shutdown -k now' on remote machine
  DEBUG:paramiko.transport:[chan 1] Max packet in: 32768 bytes
  DEBUG:paramiko.transport:[chan 1] Max packet out: 32768 bytes
  DEBUG:paramiko.transport:Secsh channel 1 opened.
  DEBUG:paramiko.transport:[chan 1] Sesch channel 1 request ok
  DEBUG:paramiko.transport:[chan 1] Sesch channel 1 request ok
  DEBUG:paramiko.transport:[chan 1] EOF received (1)
  DEBUG:paramiko.transport:[chan 1] EOF sent (1)
  error code: 0 message: 
  
  DEBUG:paramiko.transport:EOF in transport thread
  </code></pre>