cc: don.cragun at sun.com April.Chin at eng.sun.com shell-discuss at
opensolaris.org ksh93-integration-discuss at opensolaris.org
Subject: Re: Re: CR 6791838 Created P3 shell/korn93 *ksh93* unset of a
variablewhich is not set should return 0
--------
> Attached (as "ksh93_integration_unset_no_such_var_fix001.diff.txt") is a
> prototype patch which fixes the problem (well, most of it, right now $
> unset '1' # or $ unset '$' # do not return an error) and adds a new
> option ("-e") to get the old behaviour for backwards-compatibilty.
>
>
Why are you trying to merge the testing for whether a variable
exists with unset? Aren't these orthogonal? Shouldn't they
be done independently?
Currently,
[[ ${x+y} ]]
will return true if x is set and 1 otherwise, where y can be any non-empty
string.
Why can't you use this instead of unset -e which has the side effect
of unsetting the variable?
David Korn
dgk at research.att.com
