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JRuby on Rails
Running Rails on top of JRuby
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Debian Alternatives
How to use Debian Alternatives
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Handling Multiple Versions of Ruby
Use Debian Alternatives to switch between Ruby versions
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Setting up PostGIS
The steps necessary to set up PostGIS and create a database to use it
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Shared Git Repositories
How to set up your own Git repository
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Trying out Clojure
Clojure is a new JVM-based LISP
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Managing multiple GNU screen sessions
How to create and use named sessions in GNU Screen
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Regular Expressions in SQLite with Ruby
When using SQLite via Ruby, you can use implement functions in Ruby and call them from SQL
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Callbacks in Objective-C
How to pass one Objective-C function to another function and have the second function call the first!