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Asked: 2026-05-29T05:56:53+00:00

I have a downloadable Ruby client which users can install on various devices they

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I have a downloadable Ruby client which users can install on various devices they own. The client just runs every so often and sends various data to a server.

I would like to be able to uniquely identify each of a user’s devices so that I can tell which device various request originated from.

  • The ideal identifier would exist cross platform so that I can use is on OSX, Windows, Android etc.
  • It is not necessary for it to be unique among the set of all computers, just unique among the set of a single user’s computers.
  • I would rather not write my own identifier to the file system if that can be avoided.
  • The identifier should persist. Permanently if possible.

What is the simplest way to do this?

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  1. Editorial Team

    Thus far, I haven’t found a satisfactory way to do this without writing to the users machine.

    Currently, I use the UUID gem to write a 36 char unique identifier to the filesystem and then read it back whenever I have to.

    Another option if you are using > Ruby 1.9.2 is to use the SecureRandom.uuid method which does the same thing. This method is not available in Ruby 1.8.7 however.

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