Messing about with Logger

log_test.rb

require 'logger'

# Create new log file, or append to existing one.
log_file = File.open('log_test.txt', File::WRONLY | File::APPEND)

# Create log to rotate at 1MB and keep 10 logs.
log = Logger.new(log_file, 10, 1024000)

# Set the program name for logging purposes.
log.progname = 'Log Test'

# Change the log format to include the program name.
log.formatter = proc do |severity, datetime, progname, msg|
  "#{datetime}: #{progname}: #{severity} - #{msg}\n"
end

# Test different log messages.
log.fatal { "It's all gone wrong." }

log.error { "Now it's just an error." }

log.info { "Have some information." }

log.warn { "This is just a warning."}

log.debug { "Bugs! Bugs everywhere!" }

# Change logging level

log.sev_threshold = Logger::ERROR

# So this should still be logged.
log.error { "OMG! An error!" }

# But this shouldn't.
log.info { "More spurious info." }