From: William James <w_a_x_man@...>
Date: 2005-10-06T11:11:48+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

awk '!a[$0]++' infile >outfile