问题
I want to use the same SSH object to issue exec_command() multiple times in Paramiko module in Python.
The objective is to get output from the same session.
Is there a way to do it? The exec_command() closes channel once it completes executing a command and thereafter a new ssh object is needed to execute a following command .. but the sessions will differ which I do not want.
Code
import os, sys,
import connectlibs as ssh
s = ssh.connect("xxx.xx.xx.xxx", "Admin", "Admin")
channel = s.invoke_shell()
channel.send("net use F: \\\\xyz.xy.xc.xa\\dir\n")
>>>32
channel.send("net use")
>>>7
channel.recv(500)
'Last login: Tue Jun 2 23:52:29 2015 from xxx.xx.xx.xx\r\r\n\x1b]0;~\x07\r\r\n\x1b[32mAdmin@WIN \x1b[33m~\x1b[0m\r\r\n$ net use F: \\\\xyz.xy.xc.xa\\dir\r\nSystem error 67 has occurred.\r\r\n\r\r\nThe network name cannot be found.\r\r\n\r\r\n\x1b]0;~\x07\r\r\n\x1b[32mAdmin@WIN \x1b[33m~\x1b[0m\r\r\n$ net use'
>>>
回答1:
An SSH session can have multiple channels indeed (but Paramiko possibly does not support it).
But by a session you seem to imagine a "shell session". But that's not what the SSH session is. A channel is actually, what corresponds to a "shell session".
In other words, even if you could open multiple "exec" channels with Paramiko over the same SSH connection (session) and call the exec_command on these, the commands get executed in a different shell session. So it won't help you.
You can test this with PuTTY SSH client. The recent versions support connection sharing, what basically means that you can have more PuTTY windows (each using its own channel) over a single SSH connection/session. If you execute a command in one PuTTY window, and the commands changes an environment (like an environment variable or a current working directory), the change won't get reflected to the other PuTTY window, even if they share the same SSH connection.
So you need to execute the commands in one channel. Depending on your needs (which are still not clear), you need to use the "exec" or the "shell" channel.
In either case you will have troubles determining, where output of one command ends and output of other command starts as they share the same "stream".
You can solve that by inserting a unique separator (string) in between and search for it in the channel output stream.
channel = ssh.invoke_shell()
channel.send('ls\n')
channel.send('echo unique-string-separating-output-of-the-commands\n')
channel.send('pwd\n')
来源：https://stackoverflow.com/questions/30611230/use-the-same-ssh-object-to-issue-exec-command-multiple-times-in-paramiko