Painless Multiple Ruby Versions

August 28th, 2009 in Programming

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rubyI used to have three ruby versions installed on my computer, ruby 1.8.7 (*default), ruby 1.9.1p129, and jruby 1.3.0 (ruby 1.8.6p287). I installed separately on /usr and /opt. If I want use non default ruby, I simply use /path/to/ruby or using alias ruby=/path/to/ruby.
Today, I try a new gem by Wayne Seguin called Ruby Version Manager (RVM), an easy way to install and switch multiple ruby versions and it makes my life easier. RVM support three…

 

Web Scraping.. Learn the Basic

August 21st, 2009 in Programming

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Web scraping is a technique to grab -then extract- information from internet. Other terminology of web scraping is ‘beyond browser activity’, a browsing activity without a browser. Once you understand how web scraping works, and mastering technique(s) how to do that, you will find new feeling of freedom on the information access.

The most basic of web scraping is copy paste activity. You find useful information, then select, copy, then paste it. This basic technique doesn’t require any programming knowledge.…