Bash Script – How to Make a Bash Script Enter a Certain Keystroke

bashshell-scripttmux

Is there any way to make a bash script enter a certain keystroke? What I'm trying to accomplish here is a script that will run Ctrl+B to exit tmux.

EDIT: I see that several people are saying that it's better to use a program – specific command. What if I wanted to edit a text file (in this case the bash_aliases file) using a bash script?

Best Answer

If you want to interact with tmux in a script, that's where you want to use tmux ... tmux-command. Like:

tmux kill-session

To exit the current session.

tmux kill-server

To exit the server (kills all sessions).

tmux detach-client

to detach a client (exit, but you can reattach later).

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Bash script to pass arguments to a script

This is a job for expect.

Lets say your C program outputs something similar to the following:

question 1? (y/n):
question 2? (y/n):
enter some percent value:
bunch of stuff
confirm? (y/n):

You would write an expect script such as:

#!/usr/bin/expect

foreach file [glob /path/to/70k/files/*] {
  spawn "/path/to/c_prog" $file

  expect "question 1? (y/n): " { send "y\r" }
  expect "question 2? (y/n): " { send "n\r" }
  expect "enter some percent value: " { send "100\r" }
  expect "confirm? (y/n): " { send "y\r" }
  interact
}

Then either chmod +x the script and run it, or expect /path/to/script

Best Answer

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Bash script to pass arguments to a script

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