How to Remove Junk Values from SSH Output Using Paramiko?

Eliminating Junk Values from SSH Output Using Paramiko

When using Python's Paramiko library to SSH into a remote machine and retrieve command-line output, you may encounter unexpected "junk" characters in the response, such as [2Jx1b[1;1H and u. This is due to the use of ANSI escape codes, which are intended to enhance the display of output in an interactive terminal.

Using the Correct Execution Method

Paramiko's SSHClient.invoke_shell automatically requests a pseudo terminal, which can result in the inclusion of these escape codes. For automated command execution, it is better to use SSHClient.exec_command, which does not allocate a pseudo terminal by default.

Workaround for Interactive Sessions

As a workaround for interactive sessions, you can remove ANSI escape sequences using a Python library. However, this is a hack and may not fully resolve other issues related to using an interactive terminal.

Manual Creation of the Shell Channel

If you require using the shell channel due to specific server requirements, you can create the channel manually without using invoke_shell. This allows you to avoid the allocation of a pseudo terminal.

Unicode Encoding

Finally, the u prefix in the output indicates that the string is in Unicode encoding. This is important for properly handling the characters in the string.

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