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RE: faq: why doesn't tilde expansion work in shell scripts in cyg win?
- From: Randall R Schulz <rrschulz at cris dot com>
- To: cygwin at cygwin dot com
- Date: Sat, 24 Aug 2002 21:26:18 -0700
- Subject: RE: faq: why doesn't tilde expansion work in shell scripts in cyg win?
Dan,
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.html#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/cygwin/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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