Re: [Xen-devel] Re: "portable" sh is not...

["Christoph Egger" <Christoph.Egger@xxxxxxx>]

On Tuesday 23 October 2007 14:34:39 John Levon wrote:
> On Tue, Oct 23, 2007 at 02:27:07PM +0200, Christoph Egger wrote:
> > On Tuesday 23 October 2007 14:20:14 John Levon wrote:
> > > On Tue, Oct 23, 2007 at 02:14:38PM +0200, Christoph Egger wrote:
> > > > > http://xenbits.xensource.com/staging/xen-unstable.hg?rev/08295dc131
> > > > >66
> > > > >
> > > > > broke our build. The script is not portable as claimed (e.g.
> > > > > traditional Bourne shell has no $( ... ) construct).
> > > >
> > > > The only one bash-specific thing I could find was the [:alpha:]
> > > > notion. This changeset makes it work on BSD's /bin/sh.
> > > > Looks like BSD's /bin/sh is not that traditional... :)
> >
> > Looking through get-fields.sh, it seems the $( ... ) constructs can be
> > replaced with backticks. This should make Solaris' /bin/sh happy.
>
> vim is highlighting stuff like
>
>                                         type=${token#COMPAT_HANDLE?}
>                                         type=${type%?}
>                                         type=${type#compat_}
>
> as bad,

Does that imply in your case, Solaris' /bin/sh does not support these
constructs?

> but I don't know what those constructs do. 

snippet form "man sh":

     ${name#pattern}
     ${name##pattern}
             If pattern matches the beginning of the value of parameter name,
             the matched text is deleted from the result of substitution.  A
             single `#' results in the shortest match, and two of them result
             in the longest match.

     ${name%pattern}
     ${name%%pattern}
             Like ${..#..} substitution, but it deletes from the end of the
             value.


Christoph


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