sending message to subprocess with Ruby

Question

Let's say I have a process started from a ruby script like so:

pid = spawn('./my_awesome_process')
Process.detach(pid)

This process listens on STDIN. I now wish to read command line input, and send it to the process like so:

puts "Please enter input"
input = gets

How do I then forwards input to my Process?

You might take a look at the session gem: https://github.com/ahoward/session — mwp, Nov 23 '15 at 05:13
Maybe [this answer](http://stackoverflow.com/a/28966774/846163) about IPC with spawned processes is helpful. — sschmeck, Nov 24 '15 at 19:48

score 3 · Answer 1 · answered Nov 23 '15 at 16:43

3

You can use IO.popen, which attaches the subprocess's stdin and stdout to an IO object.

IO.popen('rev', 'r+') do |io|
  io.puts "I'm looking at the man in the mirror"
  io.close_write
  puts io.gets
end

rorrim eht ni nam eht ta gnikool m'I

answered Nov 23 '15 at 16:43

Kristján

1 Answers1