How to display the output of a script launched from another Ruby script in real time?

Question

I wrote a Ruby script that, at some point in its execution, will run bundle install to install gems from a Gemfile. This is the relevant part:

puts "installing gems ..."
puts `bundle install --without production`
puts "gems installed."

What happens here is that although the bundle install command is properly executed, I only see the output in the CLI once all the gems have been installed. Meaning I first get installing gems ... and then it waits and I get all the output lines of bundle install plus the gems installed message together.

Is there a way to display the output of bundle install line by line in real time as it gets executed?

David Grayson · Accepted Answer · 2014-10-03 07:17:03Z

1

One option is to use Kernel#system instead of the backticks:

system "bundle install --without production"

answered Oct 3, 2014 at 7:17

David Grayson

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1 Comment

Nico Schuele Over a year ago

Awesome! It does exactly what I need. I was sure backticks and system were aliases but obviously, I was completely wrong. Thank you.

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