From: Robert Klemme <shortcutter@...>
Date: 2007-03-17T06:35:08+09:00
Subject: Re: Executing shell commands from Ruby...  again.

On 16.03.2007 21:58, Jan Friedrich wrote:
> Kevin Skrenes schrieb:
>> I need to do this on a Windows machine, so a typical batch file might be
>> constructed like this:
>>
>>   echo off
>>   cd path\executabledir
>>   <command> -S <param> <input> <output>
>>
>> where anything in <> needs to be dynamically populated.
> How about this:
> 
> # -- BEGIN OF EXAMPLE
> 
> # setting command, param, input, output
> # ...
> cmd = <<END_OF_STRING
> echo off
> cd path\executabledir
> #{command} -S #{param} #{input} #{output}
> END_OF_STRING
> 
> system(cmd)
> 
> # -- END OF EXAMPLE

You can even combine that:

system <<CMD
echo off
cd path
#{command} -S #{arg}
CMD

And if you need a longer running shell that executes multiple commands 
you can use popen:

# IO.popen("bash", "r+") do |io|
IO.popen("cmd", "r+") do |io|
   th = Thread.new(io) do |chan|
     chan.each {|line| puts line}
   end

   # io.puts "ls -l"
   io.puts "dir"
   io.puts "exit"
   io.close_write

   th.join
end

Kind regards

	robert