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From: ra@is.uu.no (Robert Andersson)
Newsgroups: gnu.bash.bug
Subject: ${parameter-word} substitution bug in 1.04
Message-ID: <1989Dec28.182834.7529@is.uu.no>
Date: 28 Dec 89 18:28:34 GMT
Organization: International Systems A/S, Oslo, Norway.
Lines: 18

This is on an NCR Tower 32/400 running SYSVr2. 
Bash does not seem to handle ${parameter-word} substitution correctly
when parameter is one of the $1 to $9 positional parameters.
The following typescript describes the problem in detail:

Script started [typescript] at Thu Dec 28 18:16:34 1989
ra ~ $ cat bashbug
a=${1-default}
echo $a
ra ~ $ bash bashbug xxx
default
ra ~ $ sh bashbug xxx
xxx
ra ~ $ Script ended [typescript] at Thu Dec 28 18:17:06 1989
-- 
Robert Andersson, International Systems A/S, Oslo, Norway.
Internet:         ra@is.uu.no
UUCP:             ...!{uunet,mcvax,ifi}!is.uu.no!ra