`Logger`¶ ↑

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

Installation¶ ↑

Add this line to your application's Gemfile:

gem 'logger'

And then execute:

$ bundle

Or install it yourself as:

$ gem install logger

Usage¶ ↑

Simple Example¶ ↑

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")

Development¶ ↑

After checking out the repo, run the following to install dependencies.

$ bin/setup

Then, run the tests as:

$ rake test

To install this gem onto your local machine, run

$ rake install

To release a new version, update the version number in lib/logger/version.rb, and then run

$ rake release

which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Advanced Development¶ ↑

Run tests of a specific file¶ ↑

$ ruby test/logger/test_logger.rb

Run tests filtering test methods by a name¶ ↑

--name option is available as:

$ ruby test/logger/test_logger.rb --name test_lshift

Publish documents to GitHub Pages¶ ↑

$ rake gh-pages

Then, git commit and push the generated HTMLs onto gh-pages branch.

Contributing¶ ↑

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

License¶ ↑

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

Logger¶ ↑