Below are the steps to run ruby in selenium rc to run in multiple browsers

1) Record test in selenium IDE

2) After recording , convert into ruby format

3) Save into your local hard disk with .rb extension (Ex:- googlesearch.rb)

4) Download selenium rc from http://seleniumhq.org/download/

5) Install selenium-client gem

6) Run selenium rc in command prompt or in terminal as java -jar file_name.jar

7) Run saved file googlesearch.rb in command prompt or in terminal as ruby googlesearch.rb

To run in internet Explorer, opera and chrome

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 Search for keyword :browser. By default  :browser => "*chrome" , change chrome to "*iexplore" or "*iexploreproxy"  to run in internetexplorer

 For opera browser change to :browser => "*opera"

 For googlechrome browser change to :browser => "*googlechrome"