From: Brian Candler <b.candler@...>
Date: 2009-12-14T23:55:12+09:00
Subject: Re: one-liner for lowercasing files

Peter Bailey wrote:
> Can someone please suggest a simple Ruby one-liner to lowercase a
> filename (in a directory)?

Lowercase the *contents* of a file, or its *name* ?

For the contents, this example lifted almost verbatim from "man ruby".

  ruby -p -i.bak -e '$_.downcase!' /tmp/junk

To lowercase the names of all files:

  Dir["*"].each { |fn| File.rename(fn, fn.downcase) }

Beware that even ruby 1.9 won't lowercase anything other than plain A-Z.
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