How to disable control characters received with Expect.pm

Question

I am using Expect.pm to connect with SSH to a remote server. While connected, I'm sending commands via the Expect object, and I receive answers from the remote server with it's control characters:

spawn id(22): Does `show \r\033[Kadmin@host> show log \r\033[Kadmin@host> show log config \r\033[Kadmin@host> show log config result \r\033[Kadmin@host> show log config result equal \r\033[Kadmin@host> show log config result equal succeeded\r\n\033[?1h\033=\033[@959;1H\033[K'

All these control characters are messing my pattern matching done with Expect. My question is: How can I avoid seeing these control characters in the returning characters?

Answer 1

It seems some of the control characters are coming from the PS1 environvement variable, try setting that to something different after you establish the ssh session. In bash that would be:

export PS1="dummy_prompt> "

It's also worth checking what kind of environvement you have with the below command

env