From: Brian Candler <b.candler@...>
Date: 2009-01-07T19:28:16+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 "|"?

That's not a smart question.

- Show what happens if you run the same script at the command line
- Show what 'output' actually contains when doing this in Ruby
- Show what version of Ruby you are using, and under what platform

FWIW, it works just fine for me under Ubuntu Hardy with ruby-1.8.6 
compiled from source:

$ ruby -v
ruby 1.8.6 (2007-09-24 patchlevel 111) [i486-linux]
$ irb
irb(main):001:0> output=`uname -r | sed 's/\([^\.]*\.[^\.]*\)\.*.*/\1/'`
=> "2.6.24-22-386\n"
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