bin/48489: sh(1) allows trailing && and ||

[dholland%netbsd.org@localhost]

>Number:         48489
>Category:       bin
>Synopsis:       sh(1) allows trailing && and ||
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 02 04:25:00 +0000 2014
>Originator:     David A. Holland
>Release:        NetBSD 6.99.28 (20131210)
>Organization:
>Environment:
System: NetBSD valkyrie 6.99.28 NetBSD 6.99.28 (VALKYRIE) #14: Tue Dec 10 
15:15:49 EST 2013  dholland@valkyrie:/usr/src/sys/arch/amd64/compile/VALKYRIE 
amd64
Architecture: x86_64
Machine: amd64
>Description:

sh accepts trailing && or ||, which ought to be a syntax error.

>How-To-Repeat:

sh -c 'true &&'
sh -c 'true ||'

Both ksh and bash report a syntax error. For that matter, so do csh
and tcsh.

zsh does not, but zsh can't really be taken as an authoritative
reference.

>Fix:

dunno, the sh parser is an eldritch horror