topic Splitting and merging large size 'tar' files in Operating System - HP-UX

Splitting and merging large size 'tar' files

manoj_pu — Thu, 02 Mar 2006 06:53:40 GMT

Hi

Can anybody please tell me the best option for splitting and merging large size tar files?

I have a tar file of 1GB size. I need to split that file into two or three part of small size and merge it back to original.

What is the best option to do this in hp-ux os?

Regards
Manoj

Re: Splitting and merging large size 'tar' files

Peter Godron — Thu, 02 Mar 2006 07:00:24 GMT

Manoj,
have never tried it with tar files, but have a look at the split command.
As a side line, why do you have to split the file?

Re: Splitting and merging large size 'tar' files

manoj_pu — Thu, 02 Mar 2006 07:52:21 GMT

Hi Peter,

I have used the split command and splitted 1GB tar file into two parts of 500MB.

But I am not able to merge it back to original tar file using 'merge' command.

I am unable to transfer 1GB file thru network, so I want to split this file into small size and transfer.

Re: Splitting and merging large size 'tar' files

Peter Godron — Thu, 02 Mar 2006 07:54:57 GMT

Manoj,
you would not use merge to join the files back together.

I would try
cat part1 > whole_file
cat part2 >> whole_file

Re: Splitting and merging large size 'tar' files

Hemmetter — Thu, 02 Mar 2006 07:56:56 GMT

Hi Manoj

You can simplt do

cat xa* > original.tar

Rgds
HGH

Re: Splitting and merging large size 'tar' files

Arunvijai_4 — Thu, 02 Mar 2006 07:59:03 GMT

Hi Manoj,

What error you are getting when trying to merge ? Also, few things you can try

1) http://www.chami.com/Tips/internet/110896I.html

2) gzip -9 which gives the best compression ratio. You canb try to .gz the files and send it across.

-Arun

Re: Splitting and merging large size 'tar' files

Hemmetter — Thu, 02 Mar 2006 07:59:46 GMT

hi again Manoj

You can even do

cat part* | tar xvf -

to unpack without physically merging.

rgds
HGH

Re: Splitting and merging large size 'tar' files

Robert-Jan Goossens — Thu, 02 Mar 2006 08:09:39 GMT

Hi,

# split -b 10m HWE1100.depot
# ls
xaa xad xag
xab xae xah
xac xaf xai
# cat xaa xab xac xad xae xaf xag xah xai > HWE1100.depot.tar

Regards,
Robert-Jan

Re: Splitting and merging large size 'tar' files

manoj_pu — Thu, 02 Mar 2006 10:28:52 GMT

Hi,
I have tried with all options I have received. Seems all are working.
I could view and extract the content of original tar file.

However tar command comes out with expected (proper)output as well as below error message.

Tar: error! blocksize changed

What does this message indicates?

Thanks & regards

Manoj

Re: Splitting and merging large size 'tar' files

Arunvijai_4 — Thu, 02 Mar 2006 10:36:52 GMT

Hi Manoj,

Check this thread out,

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=190047
[Tar: error! blocksize changed]

-Arun

Re: Splitting and merging large size 'tar' files

Peter Godron — Thu, 02 Mar 2006 10:39:42 GMT

Arun,
if the tarfile is 1Gb in size, how can it be a >2Gb file issue?

Re: Splitting and merging large size 'tar' files

Sandman! — Thu, 02 Mar 2006 12:23:42 GMT

Hi Manoj,

The tar error regarding blocksize changed comes from the fact that you are trying to unpack the contents of the tar file in a dir which doesn't have enough space left to accomodate the unpacked files. Solution would be to either unpack it to a mount point large enough or to extend the current one, though the former option would be the fastest one.

cheers!