From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2013-01-10T00:48:53+09:00
Subject: Re: One liner for filenames

On Wed, Jan 9, 2013 at 4:09 PM, Robert Klemme
<shortcutter@googlemail.com> wrote:
> On Tue, Jan 8, 2013 at 9:48 PM, Peter Bailey <lists@ruby-forum.com> wrote:
>> Hello,
>> Can someone help me to write a Ruby one-liner to remove all the files
>> except one in a list of files? I have a list of pages of an original
>> PDF. Each page has been converted to a PNG file. They're each numbered
>> with an underscore and a number at their end.
>>
>> filename_1.png
>> filename_2.png
>> filename_3.png
>> ...
>>
>> I need to basically delete all of the files except for the first one,
>> the one with the "_1" suffix at the end. Can I do that wiith a
>> one-liner?
>
> ruby -r pathname -e 'Pathname.glob("*[^1].png").each(&:delete)'

Careful, as this skips also filename_11.png, filename_21.png, etc.
Building on this:

ruby -r pathname -e 'Pathname.glob("*_{[^1],??}.png").each(&:delete)'

Jesus.