Re: Tar and bzip2 maximum compression

[Ingo Schwarze]

Hi Philippe,

Philippe Meunier wrote on Mon, Oct 09, 2017 at 08:03:12AM -0400:
> leo_...@volny.cz wrote:

>> % tar cvvf -

> On a related note, it would be nice if tar(1)'s man page indicated that the
> -v option can be specified more than once to get extra information.  Until
> seeing this discussion thread I had never realized this was possible.

Thanks for mentioning that: millert@ just improved the manual as a result.

Yours,
  Ingo

Re: Tar and bzip2 maximum compression

[Philippe Meunier]

leo_...@volny.cz wrote:
>% tar cvvf -

On a related note, it would be nice if tar(1)'s man page indicated that the
-v option can be specified more than once to get extra information.  Until
seeing this discussion thread I had never realized this was possible.

Philippe

RE: Tar and bzip2 maximum compression

[leo_tck]

Hi,

> Hi guys,
> How can I get the maximum compression from bzip2 by tar?
>
> I try this but not work [although with linux it works]:
> tar cvv file_to_compress | pbzip2 -9 -v > compressed.tbz2
> return--> tar: Failed open to write on /dev/rst0: Device not configured
>

I believe the ancient default for tar(1) is to try to open the 0th
st(1) device in raw mode, that's what you're seeting. Try:

% tar cvvf -

(piped to whatever you want) instead.

> Can anyone give me some tips?

It's more modern to use pax(1), whose syntax is different, but which
behaves in the way you'd expect these days.

> Thanks.

You're welcome :)

--schaafuit

RE: Tar and bzip2 maximum compression

[leo_tck]

I wrote:
>
> I believe the ancient default for tar(1) is to try to open the 0th
> st(1) device in raw mode, that's what you're seeting. Try:

grah... that's st(4), of course.

--schaafuit.