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Message-ID: <c94d090c-fed5-4950-4ef1-9e3f00b7bf3a@cs.umass.edu>
Date: Tue, 3 Sep 2024 09:26:02 -0400
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Subject: Re: case-insensitive filename comparisons
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To: Rich Draves <richdr@microsoft.com>,
        "cygwin@cygwin.com" <cygwin@cygwin.com>
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From: Eliot Moss via Cygwin <cygwin@cygwin.com>
Reply-To: Eliot Moss <moss@cs.umass.edu>
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On 9/3/2024 9:13 AM, Rich Draves via Cygwin wrote:

> I often use grep -r --include. But it has a really annoying problem - the
> comparison of the filename is case-sensitive. The -i option seems to apply
> only to the regex not the filename matching.

> For example, I have many files named virtualenvironment.ini. But
> unfortunately, sometimes it is virtualEnvironment.ini,
> VirtualEnvironment.ini, etc.

> Grep -r --include=virtualenvironment.ini skips the latter files. As a
> work-around, I use --include="[Vv]irtual[Ee]nvironment.ini" but this is
> cumbersome and not a complete solution.

> Because Windows is case-insensitive/case-preserving, I think the Cygwin
> filename matching should also be case-insensitive. Am I missing something
> here?

Maybe ... Cygwin is trying to act as closely as possible to Posix behavior as
it can when running under Windows.  AFAIK, Posix does not offer
case-insensitive filename matching for grep.  While it's more cumbersome,
depending on the filenames you desire to match against, you could do something
like:

grep your-regex $(find . -iname 'virtualenvironment.ini')

The -iname operator of find asks it to do a case-insensitive filename match.
See also its -ipath and -iregex operators.

Regards - Eliot Moss

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