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class method

Gem.prefix

() -> ::String?

prefix

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems.rb, line 830
def self.prefix
  prefix = File.dirname RUBYGEMS_DIR

  if prefix != File.expand_path(RbConfig::CONFIG["sitelibdir"]) &&
     prefix != File.expand_path(RbConfig::CONFIG["libdir"]) &&
     File.basename(RUBYGEMS_DIR) == "lib"
    prefix
  end
end

The directory prefix this RubyGems was installed at. If your prefix is in a standard location (ie, rubygems is installed where you’d expect it to be), then prefix returns nil.

See also .post_uninstall .pre_install .post_reset .pre_reset also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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