From: Joel Pearson <lists@...>
Date: 2012-10-23T08:59:53+09:00
Subject: Re: Exception handelling in ruby

rescue => e
This rescues any error and lets you use 'e' as a variable to inspect the 
error.

rescue StandardError => e
This rescues any error which falls into the 'StandardError' group, and 
lets you use 'e' as a variable to inspect the error.

Think of rescue as a case statement or 'if' operator. You can rescue 
specific errors using multiple rescue lines.

something like the below would catch errors 1 and 2 respectively, and if 
the error didn't fall into those categories then the third rescue would 
catch it.

rescue 1
rescue 2
rescue

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