From: Venks <venkatesh.mantha@...>
Date: 2007-12-06T11:16:29+09:00
Subject: Re: Capturing STDOUT from a system call (POSIX) into an array

Thanks for your reply. It works now. I was looking for the method
"map" over "split".

On Dec 5, 2007 7:53 PM, Alex Gutteridge <alexg@kuicr.kyoto-u.ac.jp> wrote:
> On 6 Dec 2007, at 09:38, Venks wrote:
>
> > Thanks for your quick reply. I realize that you don't even need to use
> > split. What I am missing is how to create a 2 dimensional array with
> > each line contents in an array assuming that they are separated by a
> > COMMA.
> >
> > Let me be more specific. Assume that we have a file under
> > /tmp/test.txt with the following contents.
> >
> > aaa, 10, test1
> > bbb, 20, test2
> > ccc, 30, test3
> > ddd, 40, test4
> >
> > I want to create a 2 dimensional array with each line being an array.
> >
> > lines = `cat /tmp/test.txt` will create a single dimensional array
> > by default.
>
> I'm not so sure about that last comment. As far as I know backticks
> always return a String.
>
> The easiest way to do what you want is just to split the String from
> backticks by line and then each line by whatever delimiter you chose.
> You can do this with map for instance:
>
> [alexg@powerbook]/Users/alexg/Desktop(47): cat test.txt
> aaa, 10, test1
> bbb, 20, test2
> ccc, 30, test3
> ddd, 40, test4
> [alexg@powerbook]/Users/alexg/Desktop(48): cat capture.rb
> p `cat #{ARGV[0]}`.split(/\n/).map{|line| line.split(/, /)}
> [alexg@powerbook]/Users/alexg/Desktop(49): ruby capture.rb test.txt
> [["aaa", "10", "test1"], ["bbb", "20", "test2"], ["ccc", "30",
> "test3"], ["ddd", "40", "test4"]]
>
> Alex Gutteridge
>
> Bioinformatics Center
> Kyoto University
>
>
>
>