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Asked: 2026-05-18T12:27:20+00:00

I’m beginning to learn twisted.conch to automate some tasks over SSH. I tried to

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I’m beginning to learn twisted.conch to automate some tasks over SSH.

I tried to modify the sample sshclient.py from http://www.devshed.com/c/a/Python/SSH-with-Twisted/4/ . It runs 1 command after login and prints captured output.

What I wanted to do is to run a series commands, and maybe decide what to do based on the output.

The problem I ran into is that twisted.conch.ssh.channel.SSHChannel appears to be always closing itself after running a command (such as df -h). The example will sendRequest after channelOpen. Then the channel is always closed after dataReceived no matter what I did.

I’m wondering if this is due to server sending an EOF after the command. And therefore this channel must be closed? Should I just open multiple channels for multiple commands?

Another problem is those interactive commands (such as rm -i somefile). It seems that because the server didn’t send EOF, SSHChannel.dataReceived never gets called. How do I manage to capture output in this situation, and what do I do to send back a response?

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1 Answer

  1. Editorial Team

    Should I just open multiple channels for multiple commands?

    Yep. That’s how SSH works.

    SSHChannel.dataReceived never gets called

    This doesn’t sound like what should happen. Perhaps you can include a minimal example which reproduces the behavior.

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