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Message-ID: <15FDCE057B48784C80836803AE3598D53B885B@racerx.ixiacom.com>
From: Dan Kegel <dkegel AT ixiacom DOT com>
To: "'Randall R Schulz '" <rrschulz AT cris DOT com>,
   "'cygwin AT cygwin DOT com '"
	 <cygwin AT cygwin DOT com>
Subject: RE: faq: why doesn't tilde expansion work in shell scripts in cyg
	 win?
Date: Sun, 25 Aug 2002 19:34:11 -0700
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"

Oops, you're right.  Cygwin setup puts an icon to bash on the desktop,
so the ~ expansion I saw was by bash.

I have nothing against a speedy /bin/sh, but it seems rather short-sighted
to use a non-posix-compliant one.  Has anyone put ash (as compiled for
Cygwin) through any posix compliance tests?  Maybe all we need to do
is enable ~ expansion to become compliant... it's there in ash, just 
ifdef'd out.

- Dan

-----Original Message-----
From: Randall R Schulz

At 21:02 2002-08-24, Dan Kegel wrote:
>Aha. I figured it out, and it looks like Cygwin's ash might not be
posix 
>compliant. Tilde expansion is required by Posix; see 
><http://www.opengroup.org/onlinepubs/007904975/utilities/xcu_chap02.htm
l#tag_02_06_01>
>
>Looking at the source for the ash used in Cygwin, it looks like tilde 
>expansion is disabled! The Makefile.am in 
><http://programming.ccp14.ac.uk/ftp-mirror/programming/cygwin/pub/cygwi
n/release/ash/ash-20020731-1-src.tar.bz2> 
>defines SMALL by default, which shuts off tilde expansion. That would 
>explain my result (though not why tilde works from the ash commandline;

>curious).

Please explain "works from the ash commandline." I can see no
circumstance 
in which tilde expansion is happening in ash.


>Am I correct?  It's a little suprising to find Cygwin doesn't use a 
>Posix-compliant shell...

As I understand it, Cygwin includes ash specifically as a
very-light-weight 
shell for scripting and makefiles. It's small size and minimal feature
set 
gives it a low start-up time, which helps a lot when many of them get 
executed, for example when running make.


>- Dan


Randall Schulz
Mountain View, CA USA


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