Subject: bin/18852: /bin/sh doesn't expand "${a:-'x'}" correctly.
To: None <gnats-bugs@gnats.netbsd.org>
From: None <dsl@l8s.co.uk>
List: netbsd-bugs
Date: 10/29/2002 13:21:19
>Number: 18852
>Category: bin
>Synopsis: /bin/sh doesn't expand "${a:-'x'}" correctly.
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: bin-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Oct 29 05:21:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: David Laight
>Release: NetBSD 1.6I
>Organization:
none
>Environment:
System: NetBSD snowdrop 1.6I NetBSD 1.6I (GENERIC) #181: Thu Oct 24 14:06:02 BST 2002
dsl@snowdrop:/oldroot/usr/bsd-current/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
The shell incorrectly parses ${parameter:-word} when 'word'
contains quote characters and the entire construct is contained
within double quotes.
The construct "${x:-'$fred'}" might actually be useful...
(Spotted while looking for test cases for my fixed 'jobs'
code.))
>How-To-Repeat:
unset a;echo "${a:-'x'}"
should output the single character x, but it outputs the three
character sequence 'x'.
>Fix:
Unknown - the code for parsing quotes is already complicated,
someone who has some idea how it works might find it easier
to fix.
>Release-Note:
>Audit-Trail:
>Unformatted: