open3.rb

open3.rb: Spawn a program like popen, but with stderr, too. You might also want to use this if you want to bypass the shell. (By passing multiple args, which IO#popen does not allow)

Usage:

  require "open3"

  stdin, stdout, stderr = Open3.popen3('nroff -man')

or:

  include Open3

  stdin, stdout, stderr = popen3('nroff -man')

popen3 can also take a block which will receive stdin, stdout and stderr as parameters. This ensures stdin, stdout and stderr are closed once the block exits.

Such as:

  Open3.popen3('nroff -man') { |stdin, stdout, stderr| ... }