CODEWITHSUNDEEP
rubystdout
RobertJoseph
RobertJoseph

Reputation: 8158

Capture and display stdout text from a long running process

I am using a Ruby script to launch a long-running process that periodically sends information to STDOUT. For example:

Open3.popen3("tail  -f ./test_file") do |stdin, stdout, stderr|
  # continually read text that the tail command sends to it's STDOUT and
  # send that text to *this* process's STDOUT
  #
  # Tried the following but it doesn't work
  #
  while !stdout.eof?
    puts stdout.read
  end
end

Upvotes: 0

Views: 206

Answers (1)

RobertJoseph
RobertJoseph

Reputation: 8158

#!/usr/bin/env ruby

io_obj = IO.popen('tail -f ./test_file')

while !io_obj.eof?
  # read a line of text at a time
  result = io_obj.readline

  puts result
end

Upvotes: 1

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