bin/48356: sh(1): unsetting an undefined variable should not be an error

[yamt%NetBSD.org@localhost]

>Number:         48356
>Category:       bin
>Synopsis:       sh(1): unsetting an undefined variable should not be an error
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 01 02:10:00 +0000 2013
>Originator:     YAMAMOTO Takashi
>Release:        NetBSD current
>Organization:
        
>Environment:
        
>Description:
        with /bin/sh,
                $ unset HOGE;unset HOGE;echo $?
                1
                $ 

        susv3 says:
                Unsetting a variable or function that was not previously
                set shall not be
                considered an error and does not cause the shell to abort.

        see also:
                
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=c737a2e5641a324d3987750b73928c481a5254a0

>How-To-Repeat:
>Fix:
        

>Unformatted: