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Re: Bug in solaris 10 /bin/ksh w.r.t. test -z ")"

From: Eric Blake
Subject: Re: Bug in solaris 10 /bin/ksh w.r.t. test -z ")"
Date: Tue, 07 Sep 2010 08:38:16 -0600
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On 09/07/2010 08:24 AM, Stefano Lattarini wrote:
Hello autoconfers.

Is anyone aware of this ridicoulous bug of Solaris 10 /bin/ksh?

The manual already documents that it is non-portable:

Posix also says that @samp{test ! "@var{string}"},
@samp{test -n "@var{string}"} and
@samp{test -z "@var{string}"} work with any string, but many
shells (such as Solaris, AIX 3.2, UNICOS,
Digital Unix 4, etc.)@: get confused if
@var{string} looks like an operator:


  $ /bin/ksh -c 'test -z ")"; echo $?' # ready to laugh or cry?

this is yet another case of @var{string} that looks like an operator, and yet another reason that you should ALWAYS use test x"$val" = x rather than test -z "$val" if you don't know what $val contains.

But yes, giving this particular example in the manual would be helpful.

Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library

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