From: Robert Klemme <shortcutter@...>
Date: 2007-11-20T00:41:46+09:00
Subject: Re: Read last line of a file

2007/11/19, Gregory Seidman <gsslist+ruby@anthropohedron.net>:
> On Mon, Nov 19, 2007 at 11:38:08PM +0900, Shuaib Zahda wrote:
> > Hi all
> >
> > I was trying to find a method to read only the last line of a file. I
> > checked the the documentation and there is no such method.
> > Beside reading line after line and checking the the eof method. Is there
> > any faster or shorter way to do that.
>
> Depending on your platform, you might find that using popen with tail -1
> will be the fastest and easiest way. Failing that, consider this:
>
> last = File.open(myfile) { |f| f.extend(Enumerable).inject { |_,ln| ln } }

You do not need the ".extend(Enumerable)" bit as an IO does already
include Enumerable:

$ ruby -e 'p Enumerable === $stdin'
true

Cheers

robert

-- 
use.inject do |as, often| as.you_can - without end