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From: "Nellis, Kenneth" <Kenneth DOT Nellis AT xerox DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: RE: cygpath -w 'a"b'
Date: Thu, 14 Jul 2016 18:22:29 +0000
Message-ID: <0D835E9B9CD07F40A48423F80D3B5A704BB7ABD0@USA7109MB022.na.xerox.net>
References: <20160714172234 DOT GB19533 AT calimero DOT vinschen DOT de>
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It seems that the length of the string passed to cygpath -w 
affects whether double quotes are translated or not:

$ cygpath -w '"12345"' | od -cAn
   "   1   2   3   4   5   "  \n
$ cygpath -w '"123456"' | od -cAn
   "   1   2   3   4   5   6 357 200 242  \n
$ cygpath --version
cygpath (cygwin) 2.5.2
Path Conversion Utility
Copyright (C) 1998 - 2016 Cygwin Authors
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
$ uname -srv
CYGWIN_NT-6.1 2.5.2(0.297/5/3) 2016-06-23 14:29
$

--Ken Nellis