From: geo ssscripting <etaern@...>
Date: 2009-09-07T21:04:53+09:00
Subject: Re: Executing system commands in threads under Ruby 1.8.6

The commands executed in the script at the SO link was simply pinging 
the host on an ip range from 1 to 254 like in the following line :

`ping #{ip_addr}`

This happened from inside each individual thread. How could I replace 
the backticks so that they won't block ?
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