Mail Archives: opendos/2001/01/29/23:13:18
Hmmm, I have not had any problems with GZIP with DOS. Maybe if you gave
me some examples, I can see what is wrong. Of course I got used to using
it under Linux and am pretty familiar with it. It does not do everything
in DOS that it can do in Linux. I'll try zipping some very large files
with it and see what happens. I have some huge WINDOZE crap that I can
experiment with. However, I rarely use GZIP alone I usually use TAR and
filter GZIP though TAR. That may be where you have problems with large
files. I'll try some huge zipped WINDOZE file and just zip it again with
GZIP and see what happens. Also it is possible that DPMI is not so very
compatible with GZIP. Often I have to turn DPMI off to make programs
work right. I'll paly with it some and see if I can make it fail without
using TAR.
Pat
----- Original Message -----
From: "Da Silva, Joe" <Joe DOT daSilva AT emailmetering DOT com>
To: <opendos AT delorie DOT com>
Sent: Monday, January 29, 2001 7:09 PM
Subject: RE: TGZ compression (was Greed, nee DPMS info)
> Yep, TGZ compression is very good - "all round" it outperforms
> anything else out there (AFAIK).
>
> The only problem I have with it is that GZIP/GUNZIP is the
> most user-vicious software I have ever tried to use!!! And the
> documentation is not much help. If you know how to use it
> *safely* under various DOS environments (with and without
> LFN), please tell us the secret! After my last attempt with
> GZIP, I gave up in disgust and used WinZip to extract what
> I wanted (yep, that's the Windoze package you are probably
> thinking of ...).
>
> As for UNTGZ, this is a MUCH, MUCH more user-friendly
> piece of software. Unfortunately, it doesn't always work.
> IIRC, the documentation mentions this WRT the infamous
> LZW compression, however I think it also baulks at very
> large files (?).
>
> Speaking of LZW, this is used, not just in many GIF files, but
> also some ZIP files, some PDF files, Unix 'compress' files
> (IIRC), some other graphics formats, etc. etc. etc. It is very
> pervasive, as it was the first "good" compression algorithm
> developed. Anyway ... having a look at patents recently, it
> appears that the LZW patent is due to expire in about 2.5
> years. So eventually, all those programs where the LZW
> algorithm was removed thanks to Unisys (eg. Ghostscript,
> InfoZIP, etc.), can be made "whole" again. In the meantime
> just boycott all Unisys products! <g>
>
> Joe.
>
> > -----Original Message-----
> > From: Patrick Moran [SMTP:pmoran22 AT yahoo DOT com]
> > Sent: Tuesday, 30 January 2001 11:06
> > To: opendos AT delorie DOT com
> > Subject: Re: Greed (was DPMS info)
> >
> > I have a much better idea! Why doesn't everyone just use .tgz
files!?
> >
> > That is use TAR through GZIP. You can use TAR and GZIP on every
> > operating system I have used. it with Unix, Linux, DOS, WINDOZE
(3.x,)
> > OS/2.
> >
> > You can also use TAR and GZIP backups to tape drives, zip drives,
hard
> > drives, LS-120, MO drives, or just about any other type of drive. It
> > will work with SCSI, QIC-20/30/60/120/150/250/525/etc. It will even
work
> > with QIC-80.
> >
> > This way there would be a universal standard using FREE GNU/GPL
> > software. GZIP compression is better than PKZIP and probably equal
to or
> > better than RAR. I would have to compress some large files and see
if
> > GZIP is as good as the latest RAR. RAR may get better results from
> > multimedia files, but I get very little compression with those using
RAR
> > anyway.
> >
> > I seem to remember that you can also unzip .ZIP files with GZIP. I
> > believe that is what I did with .ZIP files under Linux. However,
PKZIP
> > cannot unzip GZIP files (at least the DOS version cannot.)The people
> > making packages and such for Linux got mad at RAR authors and have
> > pretty much given up on RAR. I can UNRAR files in Linux though.
> >
> > I think if people would use TAR and GZIP for DOS files and maybe
other
> > files (most WINDOZE users are so dumb they
> > cannot do anything but point and click! Give them a program with
some
> > real capabilities and the would be immediately lost!) All that would
be
> > needed is to start using it for DOS files and who knows maybe
someone
> > will write a frontend for it for WINDOZE and maybe even one for DOS
so
> > you don't have to remember all those modifiers. (especially for tape
> > drives.)
> >
> ----- snip -----
>
> > BTW one or both RAR and PKZIP WINDOZE versions will decompress .tgz
> > files. I don't recall which will do this. There is also a program
for
> > DOS call UNTGZ. This is very easy and simple to use for files. (not
> > tapes and other media.)
> >
> > Pat
> >
> ----- snip -----
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