On 05/06/2010 07:23 AM, Vincent Lefevre wrote: > If one follows POSIX, the correct way to do it is: > > base=$(basename "$path") > > and this is robust because the first argument is necessarily the path > (it cannot be an option, even "--").
POSIX does not forbid applications from adding extension options. And
BSD basename has done just that:
SYNOPSIS
basename string [suffix]
basename [-a] [-s suffix] string [...]
dirname string [...]
And since POSIX allows FreeBSD's extensions to exist (although a
portable script will not use them), it must also require that a portable
app be able to guarantee a way to bypass those extensions (ergo
base=$(basename -- "$path") is a POSIX requirement).
> According to
>
> grep 'basename --' /usr/bin/*
> grep 'basename \$' /usr/bin/*
>
> on my Debian machine, almost all scripts use basename without "--".
> The only exceptions are autoconf (but I'm not sure this counts, as
> there's a test for "basename --" first,
Can you find an actual example of this? I think you read it
incorrectly, as really, autoconf first tests for 'basename -- /', but if
you indeed found an instance of autoconf testing for 'basename --', that
would be a bug in autoconf that needs to be reported to that list.
>> Note solaris behaves like busybox and openbsd behaves like coreutils.
>
> Perhaps they're copying coreutils without looking at what POSIX says.
Or, more likely, perhaps they are independently obeying what POSIX says,
without reference to either coreutils or busybox.
--
Eric Blake ebl...@redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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