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ikoba/execute_external_command.rb

Last active July 19, 2023 08:05
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Execute external command and output STDOUT, STDERR in real time.
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execute_external_command.rb
require 'open3'
Open3.popen3('seq 100000') do |stdin, stdout, stderr, wait_thr|
stdin.close_write
loop do
IO.select([stdout, stderr]).flatten.compact.each do |io|
io.each do |line|
next if line.nil? || line.empty?
puts line
end
end
break if stdout.eof? && stderr.eof?
end
unless wait_thr.value.success?
puts "error occurred: status (#{wait_thr.value.exitstatus})"
end
end
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