How to Eliminate Unwanted Output When Fetching Remote CLI Data Using Paramiko?

Getting Rid of Extraneous Output When Fetching Remote CLI Output Using Paramiko

When utilizing the Paramiko library to establish a SSH connection and retrieve output from a remote machine's command-line, users often encounter extraneous characters accompanying the intended output, such as the mysterious [2Jx1b[1;1H and u. This seemingly unnecessary data can lead to confusion and can be detrimental during the extraction of crucial information.

The Source of the Junk

The perplexing characters are not junk but rather ANSI escape codes utilized by terminal clients to format and display the output in a user-friendly manner. These codes are automatically employed by Paramiko when using the SSHClient.invoke_shell method, as it presumes the establishment of an interactive terminal.

A Better Way to Execute Commands

If your task involves automating the execution of remote commands, a more suitable method is SSHClient.exec_command. This approach bypasses the allocation of a pseudo terminal by default, eliminating the additional characters.

Alternatively: Escaping the Codes

As a workaround, it is possible to remove the ANSI escape sequences from the strings using specific techniques. However, this approach may be insufficient and could introduce additional complications.

Unicode Encoding

Lastly, the u prefix in front of the string values is not part of the actual string but rather indicates Unicode encoding, a vital aspect for accurately representing characters, especially those belonging to non-English languages.

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