Re: Dashhh

[Eric Blake <eblake@redhat.com>]

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On 11/17/2011 09:17 AM, Heiko Gerstung wrote:
> What this tiny patch does:
> - shift does not return a critical error when no arguments are left, it simply does nothing

This came up in the Austin Group (the folks in charge of POSIX), and the
consensus there was that dash is compliant (POSIX says that the problem
is with the script, not the shell, if you call shift with too few
positional parameters set; and that you should rewrite your script to
avoid tickling unspecified behavior).

http://austingroupbugs.net/view.php?id=459

> - "[[" works exactly as "["

Wrong.  [[ is NOT exactly like [.  And the Austin Group is currently
considering a proposal to add [[ to the shell (if that is done, then
dash will HAVE to implement it as specified by POSIX; but the jury's
still out on whether the proposal will be accepted):

http://austingroupbugs.net/view.php?id=375

> - "==" works like "="

That same Austin Group proposal is also talking about adding [ a == b ];
this particular addition is much less controversial than the [[
addition, so it is likely that the proposal will be split and each
separate addition individually balloted for inclusion.

> - the variable FUNCNAME contains the name of the currently running shell function or nothing (when not inside a function)

That's fluff - POSIX doesn't speak either way, and dash prefers to be as
light as possible when POSIX doesn't require it, so I'm not sure if
you'll get any enthusiastic response on this front.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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