From: Josh Cheek <josh.cheek@...>
Date: 2010-10-20T16:16:58+09:00
Subject: Re: Removing files if those exists

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On Wed, Oct 20, 2010 at 1:54 AM, Simo M. <simo.maatta@gmail.com> wrote:

> Hi,
>
> I just started to work with ruby and I do not know how to do this.
>
> So I have files junk1.cs, junk2.cs, junk3.cv etc. in the same folder.
> There is also other files in the same folder that cannot be deleted.
>
> What I would like to do is
>
> If file junk*.cs exist
>  - remove all junk*.cs files from dir
>
> Thanks in advance.
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
First select them using Dir[] (you can try to get fancy with a pattern here,
but I don't think there is a way to specify multiple digits, so something
like junky.cs would get picked up by a "junk*.cs" and "junk[0-9].cs"
wouldn't pick up junk11.cs, so I'd just use "*" for the pattern.
http://ruby-doc.org/core/classes/Dir.html#M002323

Then, use the grep method to select the ones you want, since we didn't use
the pattern above. You'll have to give it a regexp, if you aren't familiar
with that, you can just use /\Afile\d+\.cs\Z/ and change out the name and
extension as necessary. It basically says if the string begins with "file",
followed by one or more digits, followed by ".cs" and nothing else, then it
is a match.
http://ruby-doc.org/core/classes/Enumerable.html#M003121

Then use each to iterate over the list of file names
http://ruby-doc.org/core/classes/Array.html#M002173

And pass them to File.delete
http://ruby-doc.org/core/classes/File.html#M002536

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