lwv@n8emr.UUCP (Larry W. Virden) (01/09/89)
Is there a way that a program could look at a file produced by tar and determine what blocking factor was used? I occasionally get tapes, disks, etc from folks who either forget to specify what they used or who 'use the default' which apparently isnt the default on any systems that I use. Then i get checksum errors, etc. attempting to untar the file. Why doesnt tar have the blocking info in it so that someone extracting the files doesnt even CARE what blocking factor was used to create it - it could just use that info if present, otherwise use whatever is specified on the comand line or as its default... Does cpio, afio, pdtar, etc. all have this 'feature'? I assume that it must be because of tradition and NOT because of some nifty benefit that one must know what blocking was used at creation to be able to get files from a tar file... -- Larry W. Virden 75046,606 (CIS) 674 Falls Place, Reynoldsburg, OH 43068 (614) 864-8817 osu-cis!n8emr!lwv (UUCP) osu-cis!n8emr!lwv@TUT.CIS.OHIO-STATE.EDU (INTERNET) The world's not inherited from our parents, but borrowed from our children.
andrew@riddle.UUCP (Andrew Beattie) (01/11/89)
In article <752@n8emr.UUCP> lwv@n8emr.UUCP (Larry W. Virden) writes: > >Is there a way that a program could look at a file produced by tar and >determine what blocking factor was used? Sure ... dd if=/dev/{put_your_tape_device_here} bs=20b count=1 |wc -c ie: use blocks as big as you can (I never met a device driver that could handle bigger than 20b), read one block, then see how many characters were in it. Divide the number by 512 to get the blocking factor +---------------------------------+-----------------+ | Andrew Beattie | Sphinx Limited | | Internal Systems Engineer | Foundation Park | | mcvax!ukc!reading!riddle!andrew | Maidenhead | | andrew@sphinx.co.uk | England | | +44 62882 2266 | SL6 3UD | +---------------------------------+-----------------+
dave@bvax.UUCP (Dave Wallace) (01/12/89)
Is there a simple explaination of the format of file that tar creates? (Assuming you tar to a file,not tape) Thanx in advance. --------------------------------------------------------------------- Dave Wallace Bell Canada ( on week days ) Toronto, Ontario, Canada uunet!attcan!utzoo!censor!bvax!dave ____________________________________________________________________
chris@mimsy.UUCP (Chris Torek) (01/13/89)
In article <965@riddle.UUCP> andrew@riddle.UUCP (Andrew Beattie) writes: >... I never met a device driver that could handle bigger than 20b 20b (in dd terms) is a mere 10240 bytes. Certainly any decent tape drive should not mind 32 kB at 6250 bpi. (Beyond 10k at 1600 and 32k at 6250, conventional 9 track tapes become overly susceptible to errors.) Modern cartridge tape drives (QIC and 8mm) handle large (>1MB) records without trouble, although they actually split them into smaller blocks (typically 1024 B). -- In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163) Domain: chris@mimsy.umd.edu Path: uunet!mimsy!chris
pss@unh.UUCP (Paul S. Sawyer) (01/17/89)
In article <15447@mimsy.UUCP>, chris@mimsy.UUCP (Chris Torek) writes: > > 20b (in dd terms) is a mere 10240 bytes. Certainly any decent tape drive > should not mind 32 kB at 6250 bpi. (Beyond 10k at 1600 and 32k at 6250, > conventional 9 track tapes become overly susceptible to errors.) My drive is limited to 8k at 1600 bpi only. (Is it indecent? B-) -- = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Paul S. Sawyer uunet!unh!unhtel!paul paul@unhtel.UUCP UNH Telecommunications Durham, NH 03824-3523 VOX: 603-862-3262 FAX: 603-862-2030
gwyn@smoke.BRL.MIL (Doug Gwyn ) (01/18/89)
In article <877@unh.UUCP> pss@unh.UUCP (Paul S. Sawyer) writes: >My drive is limited to 8k at 1600 bpi only. (Is it indecent? B-) 1600bpi is the most universal density these days. I've heard of several magtape systems that wouldn't support more than 8K (or maybe even 5K) byte records. I recall the ANSI standard doesn't require support for more than something like 2K bytes, but 5K bytes seems to work on nearly all systems encountered these days.
corwin@polari.UUCP (Don Glover) (03/08/90)
A question about tar; Is it possible to un-tar to a file systems other than the the one that was tar-ed from? Situation: I need to re-divvy may st4096, when I first set up xenix, I put about 67000 or so blocks on the root system and 70000 or so on the /u system, now I have acquired a fair amount of software that resides on the root (integra, word, the development system, sco professional, etc...) I am thinking of removing the /u all together and just having a root system so that I will be less likely to run short of space next time I install an update or something.
hautala@odin.m2c.org (11/02/90)
I am trying to extract a tar file, and it seems no matter what I do, I get this error "checksum error in directory file, possible name:" and then a bunch of garbage!!! what gives??? what is the correct command to extract all the files from a tar file in my directory???? thanx in advance
bad@atrain.sw.stratus.com (Bruce Dumes) (11/02/90)
In article <6187@m2c.M2C.ORG> hautala@odin.m2c.org () writes: > > >I am trying to extract a tar file, and it seems no matter what I do, I get >this error "checksum error in directory file, possible name:" and then a >bunch of garbage!!! > >what gives??? what is the correct command to extract all the files from a >tar file in my directory???? > >thanx in advance I've seen this when someone was trying to tar a compressed file. Later they said something like, "Ohhhh, that's what that ".Z" meant!!" By the way, tar xvf <filename> should work; you might need to specify the blocking factor. Bruce -- Bruce Dumes | "You don't see many of *these* nowdays, | bad@zen.cac.stratus.com | do you?" |
grr@cbmvax.commodore.com (George Robbins) (11/02/90)
In article <6187@m2c.M2C.ORG> hautala@odin.m2c.org () writes: > > > I am trying to extract a tar file, and it seems no matter what I do, I get > this error "checksum error in directory file, possible name:" and then a > bunch of garbage!!! > > what gives??? what is the correct command to extract all the files from a > tar file in my directory???? It is quite possible the tar tape was created with an non-default blocksize. Try something like tar xb 40 and see if that helps. You can also use dd to determine the blocksize by doing "dd if=/dev/rmt?? of=diskfile bs=127b count=1" and then ls -l to check the size of the file... -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
wnkim@violet.berkeley.edu (Satan Zoomba) (05/27/91)
Can someone clue me in here. I'm trying to extract this tar file, but when I try and invoke the tar command via.. tar -x <filename> I get this message.. tar: cannot open /dev/rmt8 Am I doing something wrong, or do I just not have access to this particular command? And is there anyway to resolve this impious situation? Rolla molla...
gilette@trinidad.inria.fr (Serge Gilette) (06/10/91)
I ftp archives from a site and i need to uncompress them, for they are tar file. I tryed to do tar -xf file.tar.Z but it gives me tar: directory checksum error (0 != -57), and if i use the -i option which is suppose to suppress such errors, it gives me a fulle page of errors ! What shall i do ? gilette@trinidad.inria.fr | University of Nice, Cote d'azur, France ------------------------------------------------------------------- He had brought a large map representing the sea, without the least vestige of land : And the crew were much pleased when they found it to be a map they could all understand. Lewis Carroll -------------------------------------------------------------------
itan@IASTATE.EDU (Tanumihardjo Idarto) (06/10/91)
In article <11711@mirsa.inria.fr>, gilette@trinidad.inria.fr (Serge Gilette) writes: > > I ftp archives from a site and i need to uncompress them, > for they are tar file. I tryed to do tar -xf file.tar.Z > but it gives me tar: directory checksum error (0 != -57), > and if i use the -i option which is suppose to suppress > such errors, it gives me a fulle page of errors ! > What shall i do ? > I think you have to use program named "uncompress" first before you can use the "tar" command. file.tar.Z --> original ftp files downloaded uncompress file.tar.Z --> produce file named file.tar tar -xf file.tar --> will extract these files to your current dir. ------------------------------------------------------------------------------- Idarto Tan internet: itan@iastate.edu Engineering Computing Support Services Iowa State University Ames, Iowa 50010
jc@raven.bu.edu (James Cameron) (06/10/91)
>>>>> On 10 Jun 91 13:22:43 GMT, gilette@trinidad.inria.fr (Serge Gilette) said:
Serge> I ftp archives from a site and i need to uncompress them,
Serge> for they are tar file. I tryed to do tar -xf file.tar.Z
Serge> but it gives me tar: directory checksum error (0 != -57),
Serge> and if i use the -i option which is suppose to suppress
Serge> such errors, it gives me a fulle page of errors !
Serge> What shall i do ?
Serge> gilette@trinidad.inria.fr | University of Nice, Cote d'azur, France
Try this:
% tar xfv filename.tar
That should do it.
jc
--
-- James Cameron (jc@raven.bu.edu)
Signal Processing and Interpretation Lab. Boston, Mass (617) 353-2879
------------------------------------------------------------------------------
"But to risk we must, for the greatest hazard in life is to risk nothing. For
the man or woman who risks nothing, has nothing, does nothing, is nothing."
(Quote from the eulogy for the late Christa McAuliffe.)lee@nic.gac.edu (Nathan Lee) (06/10/91)
gilette@trinidad.inria.fr writes: > I ftp archives from a site and i need to uncompress them, > for they are tar file. I tryed to do tar -xf file.tar.Z ^^^^^^^^^^^^^^^^^^^ > but it gives me tar: directory checksum error (0 != -57), > and if i use the -i option which is suppose to suppress > such errors, it gives me a fulle page of errors ! > What shall i do ? It seems to me that the ".Z" extension on your filename is the key to the problem you are having. You first need to "uncompress file.tar.Z", which will then uncompress the file and change the name to "file.tar", on which you should then be able to use "tar -xf file.tar". Nathan *----------------------------------------------------------------------------* | Nathan Lee || | | Gustavus Adolphus College || "Sit with a pretty girl for an hour | | St. Peter, MN 56082 || and it feels like a minute. | | || Sit on a hot stove for a minute | | (507) 933-8383 || and it feels like an hour. | | || | | || *That's* relativity." | |----------------------------------------------------------------------------| | BitNet: LEE@GACVAX1 || InterNet: lee@gacvx1.gac.edu | *----------------------------------------------------------------------------*
jpm@logixwi.uucp (Jan-Piet Mens) (06/10/91)
gilette@trinidad.inria.fr (Serge Gilette) writes: > I ftp archives from a site and i need to uncompress them, >for they are tar file. I tryed to do tar -xf file.tar.Z >but it gives me tar: directory checksum error (0 != -57), >and if i use the -i option which is suppose to suppress >such errors, it gives me a fulle page of errors ! >What shall i do ? Try either $ zcat file.tar.Z | tar xvf - or $ uncompress file.tar.Z $ tar xvf file.tar Bonne chance! -- Jan-Piet Mens, Logix GmbH jpm@logixwi.UUCP Moritzstr. 50, D-6200 Wiesbaden ...!uunet!mcsun!unido!logixwi!jpm
jc@raven.bu.edu (James Cameron) (06/10/91)
[...sorry, I was brain dead earlier today...] >>>>> On 10 Jun 91 14:57:27 GMT, jc@raven.bu.edu (James Cameron) said: >>>>> On 10 Jun 91 13:22:43 GMT, gilette@trinidad.inria.fr (Serge Gilette) said: Serge> I ftp archives from a site and i need to uncompress them, Serge> for they are tar file. I tryed to do tar -xf file.tar.Z Serge> but it gives me tar: directory checksum error (0 != -57), Serge> and if i use the -i option which is suppose to suppress Serge> such errors, it gives me a fulle page of errors ! Serge> What shall i do ? Serge> gilette@trinidad.inria.fr | University of Nice, Cote d'azur, France ME!> Try this: ME!> % tar xfv filename.tar ME!> That should do it. NO, that SHOULD NOT do it... Try this: % uncompress file.tar.Z % tar -xvf file.tar or have an alias such as: alias ux 'uncompress -c \!:1 | tar xvf - \!:2*' in your .alias file. (or other startup file like .login) (The alias is for csh or tcsh) Sorry for posting such an idiot message. I will be punished!!! jc -- -- James Cameron (jc@raven.bu.edu) Signal Processing and Interpretation Lab. Boston, Mass (617) 353-2879 ------------------------------------------------------------------------------ "But to risk we must, for the greatest hazard in life is to risk nothing. For the man or woman who risks nothing, has nothing, does nothing, is nothing." (Quote from the eulogy for the late Christa McAuliffe.)
rvp@softserver.canberra.edu.au (Rey Paulo) (06/12/91)
In article <11711@mirsa.inria.fr> gilette@trinidad.inria.fr (Serge Gilette) writes: > > I ftp archives from a site and i need to uncompress them, >for they are tar file. I tryed to do tar -xf file.tar.Z >but it gives me tar: directory checksum error (0 != -57), >and if i use the -i option which is suppose to suppress >such errors, it gives me a fulle page of errors ! >What shall i do ? > Do this: zcat file.tar.Z | tar -xvf - -- Rey V. Paulo | Internet: rvp@csc.canberra.edu.au University of Canberra | I am not bound to please thee with my answer. AUSTRALIA | -Shylock, in "The Merchant of Venice" ------------------------------+----------------------------------------------
jstewart@rodan.acs.syr.edu (Ace Stewart) (06/12/91)
In article <JC.91Jun10105727@raven.bu.edu> jc@raven.bu.edu (James Cameron) writes: > Try this: > >% tar xfv filename.tar Careful James, you missed the .Z extension of the file. Hey folks, how about followups directly to the user, and let him/her post the synopsis. Wastes a heck of a lot less bandwidth. Comments? Ace -- Ace Stewart | Affiliation: Eastman Kodak Company, Rochester, New York jstewart@rodan.acs.syr.edu jstewart@sunrise.bitnet jstewart@mothra.cns.syr.edu jstewart@sunspot.cns.syr.edu ace@suvm.bitnet rsjns@suvm.bitnet
yzarn@lhdsy1.chevron.com (Philip Yzarn de Louraille) (06/15/91)
In article <1991Jun12.140723.22110@rodan.acs.syr.edu> jstewart@rodan.acs.syr.edu (Ace Stewart) writes: >In article <JC.91Jun10105727@raven.bu.edu> jc@raven.bu.edu (James Cameron) writes: >Careful James, you missed the .Z extension of the file. Hey folks, how >about followups directly to the user, and let him/her post the >synopsis. Wastes a heck of a lot less bandwidth. > >Comments? Ace This is just the type of comments which generates lots of bandwidth! -- Philip Yzarn de Louraille Internet: yzarn@chevron.com Research Support Division Unix & Open Systems Chevron Information & Technology Co. Tel: (213) 694-9232 P.O. Box 446, La Habra, CA 90633-0446 Fax: (213) 694-7709