ruby / open3

Open3 gives you access to stdin, stdout, and stderr when running other programs.

Open3

Open3 gives you access to stdin, stdout, and stderr when running other programs.

Installation

Add this line to your application's Gemfile:

gem 'open3'

And then execute:

$ bundle

Or install it yourself as:

$ gem install open3

Usage

Open3 grants you access to stdin, stdout, stderr and a thread to wait for the child process when running another program. You can specify various attributes, redirections, current directory, etc., of the program in the same way as for Process.spawn.

• Open3.popen3 : pipes for stdin, stdout, stderr
• Open3.popen2 : pipes for stdin, stdout
• Open3.popen2e : pipes for stdin, merged stdout and stderr
• Open3.capture3 : give a string for stdin; get strings for stdout, stderr
• Open3.capture2 : give a string for stdin; get a string for stdout
• Open3.capture2e : give a string for stdin; get a string for merged stdout and stderr
• Open3.pipeline_rw : pipes for first stdin and last stdout of a pipeline
• Open3.pipeline_r : pipe for last stdout of a pipeline
• Open3.pipeline_w : pipe for first stdin of a pipeline
• Open3.pipeline_start : run a pipeline without waiting
• Open3.pipeline : run a pipeline and wait for its completion

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/open3.