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copied!<p>For Debian squeeze (6.0):</p> <p>First make sure to uninstall all ruby and ruby1.8 packages. Otherwise they will interfere with the binaries/links that are about to be set up for ruby 1.9.</p> <p>Then install the ruby 1.9 packages. Despite the fact that these packages are named '1.9.1' they actually install ruby version 1.9.2 on Debian squeeze. The virtual package <code>ruby1.9.1-full</code> will install all the packages necessary for ruby:</p> <pre><code>sudo aptitude install ruby1.9.1-full </code></pre> <p>Add alternative links for ri and manpage in the ri1.9.1 package. (These two lines are all one command.)</p> <pre><code>sudo update-alternatives --install /usr/bin/ri ri /usr/bin/ri1.9.1 10 \ --slave /usr/share/man/man1/ri.1.gz ri.1.gz /usr/share/man/man1/ri1.9.1.1.gz </code></pre> <p>Add alternative links for ruby, associated binaries, and manpages in the ruby1.9.1 package. (These lines are all one command.)</p> <pre><code>sudo update-alternatives --install /usr/bin/ruby ruby /usr/bin/ruby1.9.1 10 \ --slave /usr/share/man/man1/ruby.1.gz ruby.1.gz /usr/share/man/man1/ruby1.9.1.1.gz \ --slave /usr/bin/erb erb /usr/bin/erb1.9.1 \ --slave /usr/bin/gem gem /usr/bin/gem1.9.1 \ --slave /usr/bin/irb irb /usr/bin/irb1.9.1 \ --slave /usr/bin/rake rake /usr/bin/rake1.9.1 \ --slave /usr/bin/rdoc rdoc /usr/bin/rdoc1.9.1 \ --slave /usr/bin/testrb testrb /usr/bin/testrb1.9.1 \ --slave /usr/share/man/man1/erb.1.gz erb.1.gz /usr/share/man/man1/erb1.9.1.1.gz \ --slave /usr/share/man/man1/gem.1.gz gem.1.gz /usr/share/man/man1/gem1.9.1.1.gz \ --slave /usr/share/man/man1/irb.1.gz irb.1.gz /usr/share/man/man1/irb1.9.1.1.gz \ --slave /usr/share/man/man1/rake.1.gz rake.1.gz /usr/share/man/man1/rake1.9.1.1.gz \ --slave /usr/share/man/man1/rdoc.1.gz rdoc.1.gz /usr/share/man/man1/rdoc1.9.1.1.gz \ --slave /usr/share/man/man1/testrb.1.gz testrb.1.gz /usr/share/man/man1/testrb1.9.1.1.gz </code></pre> <p>Note that these are all installed at a low alternative priority of 10 (the last portion after the <code>--install</code> flag but before the <code>--slave</code> flags). This is done in the hope that future versions of Debian will include both ruby 1.8 and ruby 1.9 as part of the alternatives system and override these links.</p> <p>Check ri in the alternatives system:</p> <pre><code>update-alternatives --display ri </code></pre> <p>The result:</p> <pre><code>ri - auto mode link currently points to /usr/bin/ri1.9.1 /usr/bin/ri1.9.1 - priority 10 slave ri.1.gz: /usr/share/man/man1/ri1.9.1.1.gz Current 'best' version is '/usr/bin/ri1.9.1'. </code></pre> <p>Check ruby in the alternatives system:</p> <pre><code>update-alternatives --display ruby </code></pre> <p>The result:</p> <pre><code>ruby - auto mode link currently points to /usr/bin/ruby1.9.1 /usr/bin/ruby1.9.1 - priority 10 slave erb: /usr/bin/erb1.9.1 slave erb.1.gz: /usr/share/man/man1/erb1.9.1.1.gz slave gem: /usr/bin/gem1.9.1 slave gem.1.gz: /usr/share/man/man1/gem1.9.1.1.gz slave irb: /usr/bin/irb1.9.1 slave irb.1.gz: /usr/share/man/man1/irb1.9.1.1.gz slave rake: /usr/bin/rake1.9.1 slave rake.1.gz: /usr/share/man/man1/rake1.9.1.1.gz slave rdoc: /usr/bin/rdoc1.9.1 slave rdoc.1.gz: /usr/share/man/man1/rdoc1.9.1.1.gz slave ruby.1.gz: /usr/share/man/man1/ruby1.9.1.1.gz slave testrb: /usr/bin/testrb1.9.1 slave testrb.1.gz: /usr/share/man/man1/testrb1.9.1.1.gz Current 'best' version is '/usr/bin/ruby1.9.1'. </code></pre>

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