From: "Simon Kröger" <SimonKroeger@...>
Date: 2005-10-06T06:06:53+09:00
Subject: Re: One-liner removing duplicate lines

Simon Kr�ger wrote:

> Stefan Lang wrote:
> 
>> On Wednesday 05 October 2005 22:34, Ryan Leavengood wrote:
>>
>>> On 10/5/05, Ryan Leavengood <leavengood@gmail.com> wrote:
>>>
>>>> I tried creating a version that mimics the Perl one (because Ruby
>>>> also has the -n option), but in the end this seemed easier (and
>>>> much more readable):
>>>>
>>>> ruby -e "puts IO.readlines(ARGV[0]).uniq" infile > outfile
>>>>
>>>> So you are right about using uniq.
>>>
>>>
>>> Just for sake of comparison, here is the more "Perl-like" version:
>>>
>>> ruby -ne "s||={};s[$_]||print;s[$_]=1" infile > outfile
>>>
>>> Maybe some Ruby golfers can shorten it some more, but since Ruby
>>> lacks some of the more terse (and obfuscating) features of Perl, it
>>> may not be possible.
>>
>>
>>
>>     ruby -ne 'a||={};a[$_]||=(print;1)' infile > outfile
> 
> 
>       ruby -ne 'a||={};a[$_]||=print|1' infile > outfile

         ruby -ne 'a||={};a[$_]||=!print' infile > outfile

> 
> cheers
> 
> Simon
> 
>