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I would like to initiate a telnet session, send a command, and store the output in a variable using bash. To do this manually, I do:

telnet ip port
>command1

However, I'm not sure how to script this. I could easily echo something if I was just retrieving the output of something directly with command1, but I'm not sure how to bring the telnet connection into the equation.

I've tried the following command:

command1 | telnet ip port

This seems to start the telnet session, but then it tells me that the command was not found

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I think that should be:

cat file_with_command_in | telenet ip port

that way you send all input including newlines etc. (Which I suppose you could do from the command line, but a file is easier).

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  • Regarding file_with_command_in, do you mean I need to create a file with that one command, then invoke it from my main script file? If so, is there a way to do it all in one script? My overall goal is to run one script that is bound to a hotkey, save part of the output with command1, then store it as a variable for the rest of my script. Perhaps I should have mentioned that in my question.
    – hiigaran
    Oct 22, 2018 at 0:23
  • What you were doing was sending the output of command1 to telenet. In order to send 'command1' literally you would need echo command1 | telnet ..... Using cat filename is usually easier, but if the requirment is very simple then echo is the same.
    – Roger Irwin
    Oct 22, 2018 at 10:26
  • The response I get is "Trying IP. Connected to IP. Escape character is '^]'. Connection closed by foreign host."
    – hiigaran
    Oct 23, 2018 at 23:22

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