From: Quintus <sutniuq@...>
Date: 2011-08-16T15:52:55+09:00
Subject: Re: Execute command in windows command prompt from ruby code

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Am 16.08.2011 08:44, schrieb Michelle Pace:
> Hello, I have the below two commands I run from the windows command 
> prompt. I would like to now call these two commands from my local
> ruby script. How would I go about doing this?
> 
> % ipconfig /all > output.txt % convert -size 100x100 image.tiff
> image.png (I've this tool in my path)
> 
> Thank-you in advance, michelle
> 
> 
> /ASIDE:/ This specific question originated in a previous post. Since
> the answer in isolation may be useful to many people I decided to
> create a new separate post here. see
> http://www.ruby-forum.com/topic/2364739#1016854
> 

Use one of:

* system("yourcommand")
* `yourcommand` (these are backticks)
* spawn("yourcommand")

The differences:

* system waits until "yourcommand" has finished and outputs everything
  to $stdout. Then it returns true or false depending on the exitstatus.
* The backticks wait as well, but return the output made by the program.
* spawn doesn't wait, but rather returns the PID of the subprocess. Note
  that this requires Ruby 1.9 on Windows to work.

There's also exec("yourcommand"), but that's probably not what you want.
It replaces your Ruby process with "yourcommand". Oh, and IO.popen if
you need a pipeline to your process. ;-)

Vale,
Marvin
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