From: Brian Candler <b.candler@...>
Date: 2008-10-18T00:40:24+09:00
Subject: Re: Error Exception if script doesn't run

jackster the jackle wrote:
> I need to know if my script fails to run for any reason and capture the
> exception. I know how to use "rescue" for small pieces of code but how
> can I capture the stderr for anything in the script?

If you want to capture only an *exception* then wrap it like this:

begin

  .. rest of script

rescue Exception => e
  .. do something with e, e.g. write it to a log file
end

However if you want to capture everything written to stderr then that's 
a different problem. That's the responsibility of whoever started the 
Ruby process, since it would have passed it an open file descriptor for 
stderr (fd 2). For example, if you are starting ruby from a shell, then

    $ ruby foo.rb 2>errors.log

But if you were launching it from another Ruby process, then look at 
open3.rb in the standard library.
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