Hi Steffen,
> > > $tarxcmd = "tar -c -f - | $COMPRESSOR > $ar";
...
> > > unless (open XARGS, "| xargs -0 $tarxcmd 2>>$MFFN") {
> >
> > So xargs may run tar more than once, and if $#{$listref} has been
> > growing then perhaps it's tipped over from one invocation to two
> > recently?
>
> I don't understand this sentence of yours?
You're having perl open a pipe to
xargs -0 tar -c -f - | xz >monthly-backup.tar.xz
xargs runs the given command more than once under certain circumstances.
That's its raison d'être. If that happened in your case then you've
effectively run something like
(tar -c -f - foo; tar -c -f - bar) | xz >monthly-backup.tar.xz
> > Is monthly-backup.tar the value of $ar above? Or have you manually
> > decompressed it?
>
> I ran xz -d on it first, manually.
A-ha!
> > $ (tar cf - foo; tar cf - bar) | (tar tf -; tar tf -)
> > foo
> > bar
If tar did run twice to create the file then you need to run it twice
when reading the file, with the second picking up where the first stops.
p=mail/2013.track
(tar tf -; echo still want $p; tar tf -) <monthly-backup.tar |
fgrep $p
Cheers, Ralph.
