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= Description A gem that ensures only one instance of your main script is running. In short, there can be only one. = Installation gem install highlander = Synopsis require 'highlander' # This should be the -first- thing in your code. # Your code here # Meanwhile, back on the command line... # First attempt, works. Assume it's running in the background. ruby your_script.rb # Second attempt while the first instance is still running, fails. ruby your_script.rb # => RuntimeError = Notes Simply requiring the highlander gem ensures that only one instance of that script cannot be started again. If you try to start it again it will raise a RuntimeError. = Known Issues If you start your program, modify it while its running, and run it again then this library will not work. = Acknowledgements Ara Howard for ideas. = License Apache 2.0 = Copyright (C) 2010-2015 Daniel J. Berger All Rights Reserved. == Warranty This package is provided "as is" and without any express or implied warranties, including, without limitation, the implied warranties of merchantability and fitness for a particular purpose. = Author Daniel Berger