File: simple.rb

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ruby-open4 1.3.0-1
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require "open4"

pid, stdin, stdout, stderr = Open4::popen4 "sh"

stdin.puts "echo 42.out"
stdin.puts "echo 42.err 1>&2"
stdin.close

ignored, status = Process::waitpid2 pid

puts "pid        : #{ pid }"
puts "stdout     : #{ stdout.read.strip }"
puts "stderr     : #{ stderr.read.strip }"
puts "status     : #{ status.inspect }"
puts "exitstatus : #{ status.exitstatus }"