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Date: Mon, 22 Jul 2002 10:28:30 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Valid file-name characters
Message-ID: <20020722142830.GA4122@redhat.com>
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References: <000601c23161$55d02bd0$0200a8c0 AT lifelesswks> <193351029193 DOT 20020722134800 AT logos-m DOT ru>
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On Mon, Jul 22, 2002 at 01:48:00PM +0400, egor duda wrote:
>Hi!
>
>Monday, 22 July, 2002 Robert Collins robert DOT collins AT syncretize DOT net wrote:
>
>>> RC> I was just about to suggest that whatever character is used is used as
>>> RC> an escape char rather than a literal replacement.
>>> 
>>> RC> i.e. 
>>> RC> WIN32      CYGWIN
>>> 'aux%c' ->> 'aux:'
>>> 'aux%%' ->> 'aux%'
>>> 
>>> which means that
>>> 
>>> s='a%%'
>>> touch $s
>>> notepad $s
>>> 
>>> won't work.
>
>RC> Unless cygwin detects that notepad is a non cygwin program, and therefor
>RC> needs the on-disk name.
>
>Even if cygwin knows that notepad is native program it can't tell for
>sure if a%% is name of disk file. It may be a name of my dog to be
>told from my computer speakers, for instance. An he surely won't like
>if i misspell his name ;-)
>
>RC> With 
>'aux%' ->> 'aux:'
>
>RC> s='aux:'
>RC> touch $s
>RC> notepad $s
>
>RC> won't work either - unless cygwin detects that notepad...
>
>That's exactly my point. Having some fancy rules for filename encoding
>breaks interoperability with native tools. Escaping non-valid
>characters like ':' is not big problem, since native tools can't use
>such names anyway. But messing with valid characters like '%' is far
>more dangerous and error-prone.

Thanks Egor.  That's precisely why I have always avoided this kind
of filename munging in Cygwin.

cgf

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