CODEWITHSUNDEEP
clinuxunixtelnetkeystroke
mohangraj
mohangraj

Reputation: 11084

Send Keystrokes via telnet

How to send multiple keystrokes via telnet. In daily routine, I connect to a server which accept "ESC+3" and "ESC+E" like keystrokes. Now I am trying to automate the process using some programs. For that I have to give keystrokes via programatically. If it is a single line command means, it doesn't make that much complex. But the application expect keystrokes also. So, is there any way to solve this problem.

Upvotes: 0

Views: 1329

Answers (2)

Erik Bennett
Erik Bennett

Reputation: 1099

For interactive ttys, there is a program called expect. I haven't used it for a long time, but I was able to find this link: https://www.lifewire.com/linus-unix-command-expect-2201096.

It'll do what you want, I think. It was originally written in TCL (back before Linux was invented). There might be newer versions in something like Python, or some such.

Here's the "blurb": 

INTRODUCTION

Expect is a program that "talks" to other interactive programs
according to a script. Following the script, Expect knows what
can be expected from a program and what the correct response
should be. An interpreted language provides branching and
high-level control structures to direct the dialogue.

Upvotes: 0

user2371524
user2371524

Reputation:

ESC is just a normal (non printable) character with ASCII code 0x1b. So, if you have an open file descriptor fd to your service, for sending ESC+E the following will do:

write(fd, "\x1bE", 2);

Upvotes: 2

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