topic Re: Tar problem in Operating System - HP-UX

Tar problem

Deborah Grierson — Tue, 01 Oct 2002 12:41:49 GMT

I want to back up a file system to tape using tar. However there is one very large file which I don't want to back up. Any ideas how I can do this easily?

Re: Tar problem

harry d brown jr — Tue, 01 Oct 2002 12:42:40 GMT

get gnu tar:

http://hpux.cs.utah.edu/hppd/hpux/Gnu/tar-1.13.25/

or use fbackup

live free or die
harry

Re: Tar problem

Joaquin Gil de Vergara — Tue, 01 Oct 2002 12:45:47 GMT

POSIX tar is limited to 2 GB file size

use another method (fbackup or a backup software)

Re: Tar problem

Keely Jackson — Tue, 01 Oct 2002 12:49:17 GMT

Hi

Could you use 'find' to get the files you want and pipe it into tar?

Cheers
Keely

Re: Tar problem

John Poff — Tue, 01 Oct 2002 12:50:26 GMT

John,

One way to try it is to create a specific list of files to go into the tar archive. On a small scale it could work like this:

ls -l
total 10
-rw-r----- 1 jpoff users 325 Oct 1 09:51 a.txt
-rw-r----- 1 jpoff users 325 Oct 1 09:51 b.txt
-rw-r----- 1 jpoff users 325 Oct 1 09:51 c.txt
-rw-r----- 1 jpoff users 325 Oct 1 09:51 d.txt
-rw-r----- 1 jpoff users 18 Oct 1 09:52 file.list

Where file.list contains (excluding the c.txt file):

a.txt
b.txt
d.txt

Then this would work (I'm using the Korn shell):

>tar cvf jp.tar $(a a.txt 1 blocks
a b.txt 1 blocks
a d.txt 1 blocks

If you have a huge list of files this method probably won't work so good.

JP

Re: Tar problem

A. Clay Stephenson — Tue, 01 Oct 2002 12:55:02 GMT

Excluding files in tar is not easy because when directories are listed, all files in that directory are recursively copied. You can use the Gnu version of tar to exclude files but if you want to use a 'standard' utility then your best bet is to use
find ! $ -name 'myfile' $ | cpio -ocv. Like 'standard' tar, cpio is limited to files of 2GB. Gnu tar is not limited to 2GB files.

Re: Tar problem

S.K. Chan — Tue, 01 Oct 2002 12:58:40 GMT

2 ways, create a list (like index) of dir names or filenames .. for example file "list".
./fileA
./dirA
./dirB/fileB
then tar it up like so ..
# tar cvf /dev/rmt/0m $(cat list)
That way you can try your best to isolate that file that you do not want to back up. Also take not you can do tar append with "tar rvf" which you may find helpful. For instance the "big" file is in /test/bigfile and you want to back up the rest except this, you can tar up everything else then use tar append to all other files in /test expect that "big" file. You would still have to create the list like above.

Re: Tar problem

MANOJ SRIVASTAVA — Tue, 01 Oct 2002 13:01:56 GMT

Hi

Tar has a limitation for bigger files more than 2.0gb , you may try GNU tar which works better , ideally why dont you swtich over to fbackup stuff ?

Manoj Srivastava

Re: Tar problem

ITeam — Tue, 01 Oct 2002 14:02:54 GMT

Use the find command to get list of files to be backed up, then pipe via egrep (or grep -v) to exclude chosen file(s), finally pipe the output into tar ...

This works just fine when you have loads of files in a subdirectory but have specific files, or even whole subdirectories, you want excluded.

For example, to dump contents of two data areas, but exclude the "test" sub-directories
you could use...

cd /disk1/live
find data1 data2 -print | egrep -v 'data1/test|data2/test' | tar -cvf /dev/rmt/0m ${TTY}

The above egrep needs the ' ' around the data1/test and data2/test to qualify the use of the | as an "or" operator to the exclusion.

This method is commonly used by our customers (though we actually use a hybrid version of tar that is much more efficient).

Re: Tar problem

Deborah Grierson — Wed, 02 Oct 2002 06:15:02 GMT

All,

Thanks for your help. I went with the Alphameric solution and it worked fine.

John