*Synopsis*: *ksh93* unset of a variable which is not set should return 0

CR 6791838 changed on Nov 23 2009 by <User 1-2S67RN>

=== Field ============ === New Value ============= === Old Value =============

Integrated in Build    snv_128                                                
Status                 10-Fix Delivered            8-Fix Available            
====================== =========================== ===========================

     
*Change Request ID*: 6791838

*Synopsis*: *ksh93* unset of a variable which is not set should return 0

  Product: solaris
  Category: shell
  Subcategory: korn93
  Type: Defect
  Subtype: Functionality
  Status: 10-Fix Delivered
  Substatus: 
  Priority: 3-Medium
  Introduced In Release: solaris_nevada
  Introduced In Build: snv_72
  Responsible Engineer: <User 1-7MTUEB>
  Keywords: ONPIT_OSOL_TRANSITION, oss-request, oss-sponsor

=== *Description* ============================================================
In ksh93, the special builtin "unset" will exit 1 when its argument is a
variable which is not set, but it should exit 0, according to the POSIX 
standards.
The problem occurs with the ksh93 integrated into snv_72, as well as the
latest ksh93 (based on AT&T's ast-ksh 2008-11-04) integrated into snv_106.

In ksh93:
% unset foo
% echo $?
1

This behavior caused problems in Makefile scripts when ksh93 is used.
See CR 6791110 - perl doesn't build when VERSION is not set

*** (#1 of 1): 2009-01-09 01:58:02 GMT+00:00 <User 1-5Q-5151>


=== *Public Comments* ========================================================

=== *Workaround* =============================================================

=== *Additional Details* =====================================================
        Targeted Release: solaris_nevada
        Commit To Fix In Build: snv_128
        Fixed In Build: snv_128
        Integrated In Build: snv_128
        Verified In Build: 
  See Also: 6437624, 6791110, 6791841, 6793763, 6897170
  Duplicate of: 
  Hooks:
        Hook1: 
        Hook2: 
        Hook3: 
        Hook4: 
        Hook5: <email address omitted>
        Hook6: <email address omitted>
  Program Management: 
  Root Cause: Inadequate Requirements
  Fix Affects Documentation: No
  Fix Affects Localization: No

=== *History* ================================================================
        Date Submitted: 2009-01-09 01:58:01 GMT+00:00
        Submitted By: <User 1-5Q-5151>

        Status Changed    Date Updated                  Updated By
        5-Cause Known     2009-01-09 02:00:01 GMT+00:00 <User 1-5Q-5151>
        6-Fix Understood  2009-06-16 15:14:26 GMT+00:00 <User 1-1SURPB>
        7-Fix in Progress 2009-10-23 21:20:17 GMT+00:00 <User 1-7MTUEB>
        8-Fix Available   2009-10-28 18:23:32 GMT+00:00 <User 1-5HNZ8F>
        10-Fix Delivered  2009-11-23 05:16:52 GMT+00:00 <User 1-2S67RN>


=== *Service Request* ========================================================
        Impact: Significant
        Functionality: Secondary
        Severity: 3
        Product Name: solaris
        Product Release: solaris_nevada
        Product Build: 
        Operating System: solaris_nevada
        Hardware: generic
        Submitted Date: 2009-01-09 01:58:02 GMT+00:00


=== *Service Request* ========================================================
        Impact: Significant
        Functionality: Primary
        Severity: 2
        Product Name: step
        Product Release: 3.0
        Product Build: 3.0
        Operating System: all
        Hardware: generic
        Submitted Date: 2009-11-02 13:10:43 GMT+00:00


=== *Multiple Release (MR) Cluster* - 0 ======================================

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