Open3 grants you access to stdin, stdout, stderr and a thread to wait the child process when running another program.

Example:

require "open3"
include Open3

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

Open3.popen3 can also take a block which will receive stdin, stdout, stderr and wait_thr as parameters. This ensures stdin, stdout and stderr are closed and the process is terminated once the block exits.

Example:

require "open3"

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