How to Eliminate Junk Values in Paramiko SSH Output?

Ridding Junk Values from SSH Output using Paramiko

When fetching output from a remote machine's CLI via Paramiko's SSH library, one may encounter unsolicited characters such as "x1b[2Jx1b[1;1H" and "u." These are ANSI escape codes that embellish output for terminal clients.

Cause and Resolution

Paramiko's SSHClient.invoke_shell prompts for a pseudo terminal, resulting in the appearance of these escape codes. For automated command execution, it's recommended to use SSHClient.exec_command instead, which does not allocate the pseudo terminal by default.

<code class="python">stdin, stdout, stderr = client.exec_command('ls')</code>

Alternative Solutions

If using the "shell" channel is imperative, it's feasible to do so without the pseudo terminal, but Paramiko's SSHClient.invoke_shell does not offer this feature. One can manually create the "shell" channel instead.

<code class="python"># Not supported by Paramiko SSHClient.invoke_shell
channel = ssh_client.get_transport().open_channel("session")
channel.exec_command("ls")</code>

Unicode Encoding Note

The "u" prefix in the output strings indicates Unicode encoding, which should be preserved.

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