![]() Second, a shim can add microseconds of delay to execution of a Ruby command. For example, the which ruby command shows the Rbenv shim, not the actual Ruby version (you must set the RBENV_DEBUG environment variable if you want to see the actual Ruby command). First, shims make troubleshooting more difficult by hiding the actual command. The shim calls the rbenv exec command, which determines which version of Ruby to use before running any Ruby command. (Asdf also uses shims.)Īfter installing Rbenv with Homebrew, you must modify your ~/.zshrc file so the Rbenv shims take precedence over ordinary Ruby commands. Rbenv uses shims to intercept common Ruby commands. RbenvĪlong with RVM, Rbenv has long been the most popular version manager for Ruby. The additional complexity isn’t needed, so many developers have switched to a newer version manager such as Rbenv, Chruby, or Frum. Gemsets are no longer needed, since Bundler was added to the core Ruby to manage gem dependencies. However, RVM includes additional features such as gemsets. RVM properly displays environment variables to reveal the Ruby and gem version and location, which can help diagnose problems. To override the cd command, the RVM installation script changes the shell configuration file (the ~/.zshrc file on newer Macs). RVM modifies the system cd command to set environment variables when you change directories. RVM was the first popular version manager for Ruby. Differences among the four lie in speed, complexity, and how each switches Ruby versions. ![]() If you only intend to develop applications using Ruby, choose among the four Ruby-only version managers: Chruby, Frum, Rbenv, and RVM.
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