From: Eric Blake <eblake@redhat.com>
To: Adam Kellas <Adam.Kellas@gmail.com>
Cc: dash@vger.kernel.org
Subject: Re: dash -n and -v not implemented?
Date: Mon, 23 Aug 2010 14:22:39 -0600 [thread overview]
Message-ID: <4C72D88F.1000502@redhat.com> (raw)
In-Reply-To: <i4uj8q$ah3$1@dough.gmane.org>
On 08/23/2010 01:47 PM, Adam Kellas wrote:
> Am I missing something, or do the -n and -v flags have no effect? The
> following compares the behavior of bash, ksh, and dash (bash requires an
> extra flag to suppress startup files):
>
> % ksh -v -n -c uname
> uname
>
> % bash --norc -v -n uname
> uname
>
> % dash -v -n -c uname
> Linux
POSIX states that an interactive shell may ignore 'set -n'; and by
extension, 'sh -n' can be a no-op if the shell would otherwise be
interactive. But your example is not an interactive shell; and POSIX is
clear that both -v and -n must have the same effect as an option to the
shell command line as they would have to a use of set within the shell.
I think the absence of handling for both of these options is a definite
bug according to POSIX rules on sh.
--
Eric Blake eblake@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
prev parent reply other threads:[~2010-08-23 20:22 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 19:47 dash -n and -v not implemented? Adam Kellas
2010-08-23 20:22 ` Eric Blake [this message]
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