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RE: faq: why doesn't tilde expansion work in shell scripts in cyg win?
- 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>
- Date: Sun, 25 Aug 2002 19:34:11 -0700
- Subject: RE: faq: why doesn't tilde expansion work in shell scripts in cyg win?
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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