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Have a ruby script output what version of ruby is running it

How do I have my ruby script output what version of ruby is running it?

Solution

  • The RUBY_VERSION constant contains the version number of the ruby interpreter and RUBY_PATCHLEVEL contains the patchlevel, so this:

    puts RUBY_VERSION

    outputs e.g. 2.2.3, while this:

    puts RUBY_PATCHLEVEL

    outputs e.g. 173. Together it can be used like this:

    ruby -e 'print "ruby #{ RUBY_VERSION }p#{ RUBY_PATCHLEVEL }"'

    to output e.g. ruby 2.2.3p173