From: "Simon Kröger" <SimonKroeger@...>
Date: 2005-10-06T05:37:35+09:00
Subject: Re: One-liner removing duplicate lines

Damien Wyart wrote:

> Hello,
> 
> Converting from Perl to Ruby, I am trying to find an equivalent to this
> Perl one-liner removing duplicate lines in a file (without sorting it at
> first) :
> 
>    perl -ne'$s{$_}++||print' infile >outfile
> 
> I guess uniq method could be used, but I can't find how.

true,

open(outfile, 'w'){|out| out << IO.readlines(infile).uniq.join}

cheers

Simon