Document Monitoring in Ruby 

# This program watches a file for changes.  Whenever a change is made, it
# prints a message in the terminal.
 
require 'ftools'
 
log_file = "test.log"
last_change = File.mtime(log_file)
 
while(true)
  if File.readable?(log_file) && 
    (file_time = File.mtime(log_file)) > last_change
 
    last_change = file_time
    puts "Log has been updated"
  end
end
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