CODEWITHSUNDEEP
ruby
Sam
Sam

Reputation: 6250

Stream output of child process in Ruby

I want to be able to stream the output of a child process in Ruby

e.g.

p `ping google.com`

I want to see the ping responses immediately; I don't want to wait for the process to complete.

Upvotes: 7

Views: 2189

Answers (3)

Bozhidar Batsov
Bozhidar Batsov

Reputation: 56595

If you'd like to capture both the stdout and stderr you can use popen2e:

require 'open3'

Open3.popen2e('do something') do |_stdin, stdout_err, _wait_thr|
  stdout_err.each { |line| puts line }
end

Upvotes: 4

coreyward
coreyward

Reputation: 80041

You can do the following instead of using backticks:

IO.popen('ping google.com') do |io|
  io.each { |s| print s }
end

Cheers!

Upvotes: 9

Dylan Markow
Dylan Markow

Reputation: 124419

You should use IO#popen:

IO.popen("ping -c 3 google.com") do |data|
  while line = data.gets
    puts line
  end
end

Upvotes: 6

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