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Why is Logger output to STDOUT not redirected to files?

This script has a name o.rb:

@logger = Logger.new(STDOUT)
@logger.info "start_time : #{start_time}"

When I run it with ./o.rb, the console output is correct.
However, when I tried ./o.rb > log.txt 2>&1, the log file is empty!
Why did this happen?

I have the same problem when using a simple function puts.

UPDATE

This will reproduce this issue:

require 'logger'

logger = Logger.new(STDOUT)

loop do
  logger.info "This is a test haha"
  sleep(1)
end

When I run it with ./foo.rb, it correctly writes the console output.

When I start ./foo.rb > log.txt, I get nothing.

Also, when I use ./foo.rb | tee log.txt, nothing is written to the console and the log file is empty.

The log.txt file was created, but remains empty.

My version of Ruby is 1.8.7.

+5
1

, , .

#!/usr/bin/env ruby

require 'logger'

$stdout.sync = true
logger = Logger.new($stdout)

loop do
  logger.info "This is a test haha"
  sleep 1
end
+11

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