Logger is a simple but powerful logging utility to output messages in your Ruby program.

Logger has the following features:

• Print messages to different levels such as info and error
• Auto-rolling of log files
• Setting the format of log messages
• Specifying a program name in conjunction with the message

Add this line to your application's Gemfile:

gem 'logger'

And then execute:

$ bundle

Or install it yourself as:

$ gem install logger

require 'logger'

# Create a Logger that prints to STDOUT
log = Logger.new(STDOUT)
log.debug("Created Logger")

log.info("Program finished")

# Create a Logger that prints to STDERR
error_log = Logger.new(STDERR)
error_log = Logger.error("fatal error")

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in lib/logger/version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

--location option is available as:

ruby test/logger/test_logger.rb --location 40

Bug reports and pull requests are welcome on GitHub at https://github.com/ruby/logger.

The gem is available as open source under the terms of the BSD-2-Clause.