From: mgarriss <mgarriss@...>
Date: 2003-08-26T03:13:51+09:00
Subject: Re: Ruby launching system apps?

Dan wrote:

>I have a UNIX machine and I want a ruby app that can launch UNIX commands
>like awk or sed...how would I implement this?
>
>use Shell.new?
>  
>

`cat some_file`          # returns string of stdout
system 'cat some_file'   # returns success (true/false)
exec 'cat some_file'     # replaces current process
popen 'cat some_file'    # returns IO object connected to stdin and stdout

require 'open3'
Open3.popen3 'cat some_file' # returns [in,out,err]