Rubies (or rbs) is a small script to switch Ruby runtimes by rewriting PATH and GEM_HOME environment variables. No tricks. The script is written in Ruby works with a small shell script.

This script does

• Switch Ruby in your shell environment.
• Switch RubyGems repository.

This script doesn't

• Install, uninstall Ruby.
• Install, uninstall RubyGems itself.
• Manage gems, libraries, etc.

1. Clone this repository to ~/.rubies.

2. Source ~/.rubies/src/rubies.sh in your ~/.bashrc or ~/.zshrc. Sorry, no csh support.

   source "$HOME/.rubies/src/rubies.sh"
   

3. Install Ruby into ~/.rubies by yourself from Ruby source code. Rubies provides configure scripts, patches are in ~/.rubies/src/.

   $ tar xjvf ruby-2.7.2.tar.bz2
   $ mkdir -p ruby-2.7.2/build
   $ cd ruby-2.7.2/build
   $ sh ../../configure.sh
   $ make install
   

4. If you wanted to select installed Ruby more easy, create a symlink.

   $ cd ~/.rubies
   $ ln -s ruby-2.7.2 ruby27
   

5. Switch Ruby by rubies or rbs command.

   $ rubies ruby27
   

rvm provides cd command hook so we can switch Ruby in each project directories which is nice. Rubies provides same hook which can read existing .rvmrc file.

1. Add enable_rubies_cd_hook in your ~/.bashrc or ~/.zshrc after source ~/.rubies/src/rubies.sh.

   source "$HOME/.rubies/src/rubies.sh"
   enable_rubies_cd_hook
   

2. Place .rubiesrc in each project directory or ~/ which can select default Ruby. .rubiesrc is YAML format. We can use only ruby parameter for now which selects Ruby.

   $ echo "ruby: ruby27" > ~/.rubiesrc