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Re: [BackupPC-users] XferLog.z : How do I read this thing?
2012-02-10 09:53:25
"Jeffrey J. Kosowsky" <backuppc AT kosowsky DOT org>
wrote on 02/10/2012 08:55:34 AM:
> Timothy J Massey wrote at about 17:40:43 -0500 on Thursday, February
9, 2012:
> > Bowie Bailey <Bowie_Bailey AT BUC DOT com> wrote on 02/09/2012
05:01:32 PM:
> >
> > > On 2/9/2012 4:51 PM, Timothy J Massey wrote:
> > > > Hello!
> > > >
> > > > I've set up a new backup server, and for the
first time I haven't
> > > > disabled compression. BackupPC is now creating
log files in (what it
> > > > is claiming is) .z format. How do I read
these? I've tried zcat
> > > > ("not in gzip format"), uncompress
(no error, but no file), and unzip
> > > > (end of central directory not found). "file
XferLog.0.z" says that
> > > > this file is "data" (which doesn't
help...).
> > > >
> > > > So, how do I read these files, and even better:
how do I go back to
> > > > my plaintext logs?
> > > >
> > > > (I *knew* there were great reasons why I have
always immediately
> > > > disable compresson on all of my backup servers!
:) )
> > >
> > > Backuppc uses a special compression format. You
can read it with the
> > > BackupPC_zcat program. On my machine, it is
located in
> > > /usr/local/BackupPC/bin.
> >
> > I love BackupPC, but that is the *dumbest* thing *ever*.
(Sorry, Craig!
> > :) ).
>
> Why?
>
> BackupPC compresses and pools the log files which is consistent with
> the handling of all other files in the pc tree (except for the
> 'backups' info file). This keeps everything streamlined and
> consistent.
At the price of making it, at a very minimum, very
awkward to deal with. I can't easily cat, grep, tail, etc. I
have to perform jumping-jacks to do any of these things, just so the files
can be compressed.
And why would *log* files necessarily be handled consistently
with backup data files? Do image manipulation programs store their
log files in .GIF's?
In any case, the why or why not is not terribly important:
it *does*. I asked if there was a way to make it not. I
can only assume from the silence that there is not.
> > And even if you for some reason thought
that was a *brilliant* idea, why
> > wouldn't you change the extension? Would bpz be so
hard? :)
>
> Because it uses zLib compression and I believe .Z is a common
> extension for that. This is not the DOS/Windows world where you just
> willy-nilly make up new 3 letter extensions for every program under
> the sun.
No. .Z is *not* simply an extension for "I
used zLib on this". .Z is the extension used for files created
by the "compress" command. Try using the "compress"
command on a BackupPC log file...
And whether UNIX or DOS, having two *incompatible*
file types share the same extension is just a really bad idea. Would
you expect to find a .gz file that couldn't be handled by gzip?!? Oh,
excuse me, was that neither helpful nor intelligent?
Tim Massey
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