Re: Redirections and noclobber
On Wed, Oct 06, 2004 at 06:19:35PM +0200, Bill Allombert wrote:
> On Wed, Oct 06, 2004 at 05:02:00PM +0200, Frank Küster wrote:
> > Hi,
> >
> > in bug #275140, I was made aware of a problem with the handling of
> > tempfiles in tetex's maintainer scripts, and it seems to be a general
> > problem. Basically, we do
> >
> > tempfile=`mktemp`
> > echo something > $tempfile
> >
> > and this will fail if the noclobber option is set in the executing
> > shell, because after mktemp the $tempfile exists.
> >
> > It is easy to fix this:
> >
> > echo something >| $tempfile
> >
> > but both I and the bug submitter were puzzled that we didn't find any
> > previous discussions about the topic. Obviously, noclobber is only
> > rarely used (otherwise we would have gotten bugreports earlier), but I
> > see no reason, neither in Policy nor in "common sense", why root
> > shouldn't use it. On the other hand, this usage of mktemp has been
> > the result of discussions on debian-tetex-maint@l.d.o, and I'm quite
> > sure to have seen it elsewhere.
>
> In my opinion, noclobber should only be set for interactive shell, or
> explicitely in a shell-script. The same for most others shell options.
>
> Now, does POSIX sh support >| ?
Yes.
Regards: David Weinehall
--
/) David Weinehall <tao@acc.umu.se> /) Northern lights wander (\
// Maintainer of the v2.0 kernel // Dance across the winter sky //
\) http://www.acc.umu.se/~tao/ (/ Full colour fire (/
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