Posted about 8 years ago. Visible to the public. Linked content.

Cryptic Ruby Global Variables and Their Meanings

The linked page lists and explains global Ruby "dollar" variables, such as:

  • $: (load path)
  • $* (ARGV)
  • $? (Last exit status)
  • $$ (PID)
  • $~ (MatchData from last successful match)
  • ...and many more you'll need when reading weird code.


  • $~ (last MatchData)
  • $1 $2 $3 $4 (match groups from the last pattern match)
  • $& (last matched string)
  • $+ (last match group)
  • `$`` (the string before the last match)
  • $' (the string after the last match

See this extensive list of variables.

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

Owner of this card:

Arne Hartherz
Last edit:
over 5 years ago
by Dominik Schöler
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
License for source code
Posted by Arne Hartherz to makandra dev
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