From: Edwin van Leeuwen <edder@...>
Date: 2006-05-03T20:53:40+09:00
Subject: Re: Calling Shell Scripts from Ruby ?

Dinesh Umanath wrote:
> Hi Shev,
> 
> Thank for the reply. But my requirement is that i have to call the shell 
> scripts or Unix Commands from Ruby itself, rather than from IRB ?? 
> Because i will be basicall invoking the ruby from Web (Rails)?
> 
> Thank You..
>> 1) Start irb. Then do this:
>> 2) cmd_result = `ls`
>> 
>> # => "acoc-0.7.1.tar.bz2\n   (and much more but i edited it out)
>> 
>> 3) puts cmd_result.class  # => String
>> 
>> 4) Create a shell file such as test.sh, with content like
>> echo "This is a test"
>> 
>> 5) `sh test.sh`
>> 

Thx shev for being more verbose, that was what I was hinting at. At 
heart invoking sh test.sh is the same as invoking any (unix)command and 
you can do that by putting the command between ``

As you can see from irb this will also give you the output of the file.

There is no difference between doing something in irb and in a normal 
ruby file, except that irb gives you immediate feedback for testing 
purposes. So you can just put `a_unix_command` in your ruby file to 
execute commands. (Where you replace a_unix_command by the actual 
command/script you want to execute.)


Edwin

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