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Subject: Re: patch command incorrectly capitalizes filenames that live on
 external USB flash drives
To: cygwin <cygwin AT cygwin DOT com>, Thomas Wolff <towo AT towo DOT net>,
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From: Ken Brown via Cygwin <cygwin AT cygwin DOT com>
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On 5/13/2020 8:31 PM, Jason Gross via Cygwin wrote:
> This does not explain why `ls` displays "Makefile" as "Makefile"
> before I run `patch`, but displays the filename as "MAKEFILE" after I
> run `patch`.  Nor does it explain why this happens to patch-modified
> files, but not to files modified via sed -i.

I vaguely recall from several years ago a strange patch issue that I finally 
tracked down to environment variables used by patch to determine its temporary 
directory.  From 'man patch':

ENVIRONMENT
[...]
        TMPDIR, TMP, TEMP
           Directory  to  put temporary files in; patch uses the first environ‐
           ment variable in this list that is set.  If none are  set,  the  de‐
           fault is system-dependent; it is normally /tmp on Unix hosts.

Do you have any of those variables set to a value other than /tmp?

Ken
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