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From: "Michel LaBarre" <michel DOT labarre AT rogers DOT com>
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Subject: RE: sed seems to force UC filename on Mixed 8.3 filenames on FAT32
Date: Mon, 5 Mar 2018 11:42:29 -0500
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> -----Original Message-----
> From: cygwin-owner AT cygwin DOT com [mailto:cygwin-owner AT cygwin DOT com] On
> Behalf Of Fergus Daly
> Sent: March 5, 2018 4:06 AM
> To: The Cygwin Mailing List
> Subject: Re: sed seems to force UC filename on Mixed 8.3 filenames on
> FAT32
> 
> >> ..."or operation on FAT32 was changed by Windows updates."
> 
> Starting to look exactly like that. On Windows 7 there is no problem.
> On earlier W10 machines in this office there is no problem. My machine
> underwent a massive (time-consuming) update on or around 13-FEB to
> Microsoft Windows Version 1709 Build 16299.248]
> from the previous
> Microsoft Windows Version 1703 Build 15063.936]
> and the troubles began then:
> 
> ~> touch TryThis.TxT
> ~> ls T*
> TryThis.TxT
> ~> dos2unix TryThis.TxT
> dos2unix: converting file TryThis.TxT to Unix format...
> ~> ls T*
> TRYTHIS.TXT
> 
> This on a FAT32 stick. (Can anybody confirm this behaviour?) So I'm
> guessing Windows has revised its default mount shortname syntax for
> VFAT. Is there a way I can climb in and alter / override that, does
> anybody know?

I have the same build 16299.248 and I get the same behaviour.
Perhaps consider: http://www.zoneutils.com/regtricks/filesystem.htm
for parameters to experiment with.  You can use fsutil to control some of these to avoid direct registry modifications.
I expect it is more subtle otherwise the pervasive nature of the flags would mean that any file creation would result in UC names, not just dos2unix.
i.e. ls > Foo.txt should produce FOO.TXT

My dos2unix is version 7.3.5
Cygcheck -V is 2.9.0

> 
> Fergus
> 
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