Question

I want to be able to start a process and send input to it immediately.

Take Bash as an example.

The following code will enter another Bash process and then print “Hello World!” on the screen after I have terminated the process with “exit”

bash
echo "Hello World!"

Is there a way to enter bash and then print “Hello World!” INSIDE that process?

I’m using Ruby and Bash on Ubuntu.

UPDATE: This question was not intended to be Bash specific. Bash was just an example. It would be better if someone could post an answer that handles all other binaries.

Answer 1

You may be looking for the expect tool.