ruby-switch(1) switch between different Ruby interpreters


ruby-switch --list

ruby-switch --check

ruby-switch --set RUBYVERSION

ruby-switch --auto


ruby-switch can be used to easily switch to different Ruby interpreters as the default system-wide interpreter for your Debian system.

When run with --list, all supported Ruby interpreters are listed.

When --check is passed, ruby-switch will check which Ruby interpreter is currently being used. If the settings are inconsistent --- e.g.
  `ruby` is Ruby 1.8 and `gem` is using Ruby 1.9.1, ruby-switch will issue a big warning.

When --set RUBYINTERPRETER is used ruby-switch will switch your system to the corresponding Ruby interpreter. This includes, for example, the default implementations for the following programs: ruby, gem, irb, erb, testrb, rdoc, ri.

ruby-switch --set auto will make your system use the default Ruby interpreter currently suggested by Debian.


-h, --help
Displays the help and exits.


Ruby uses two parallel versioning schemes: the `Ruby library compatibility version' (1.9.1 at the time of writing this), which is similar to a library SONAME, and the `Ruby version' (1.9.3 is about to be released at the time of writing).

Ruby packages in Debian are named using the Ruby library compatibility version, which is sometimes confusing for users who do not follow Ruby development closely.

ruby-switch also uses the Ruby library compatibility version, so specifying `ruby1.9.1' might give you Ruby with version 1.9.2, or with version 1.9.3, depending on the current Ruby version of the `ruby1.9.1' package.


Copyright (c) 2011, Antonio Terceiro <[email protected]>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <>.