From: Albert Schlef <albertschlef@...>
Date: 2009-01-07T21:01:29+09:00
Subject: Re: A question about running external program

Zhao Yi wrote:
> I use this method to run an external program:
> 
> output=`uname -r | sed 's/\([^\.]*\.[^\.]*\)\.*.*/\1/'`
> puts output
> 
> ruby will ignore the sed command. Doesn't ruby support "|"?

Instead of strugling with shell-escaping, you can do the regexp part in 
Ruby itself:

  output = `uname -r`
  version = output[ /some-regexp/ ]
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