topic Re: TAR command in Operating System - HP-UX

TAR command

Mauro_8 — Tue, 22 Oct 2002 15:14:14 GMT

Hi,

I want to backup some files in a tar file, named day_of_month.tar and send to the tape. But I do not have free space to create this tar file in my hard disk and then send to tape. So, is there a way of creating this file on the tape without using a temp file in the hard disk ?

I??m doing this:

%tar cvf /home/temp.tar /opt /var /work
%tar cvf /dev/rmt/0mn /home/temp.tar

I want to avoid the creation of temp.tar.

Cheers,
Mauro

Re: TAR command

RAC_1 — Tue, 22 Oct 2002 15:18:10 GMT

tar -cvf /dev/rmt/0m /opt /var /work

is all you require

Re: TAR command

Jeff Schussele — Tue, 22 Oct 2002 15:22:49 GMT

Hi Mauro,

You can just tar them directly to the tape drive

tar cvf /dev/rmt/0mn /opt /var /work

They will not be in a tar file on the tape but just the actual files archived with absolute pathnames.
So if you think you may want to extract them to another location, you may wish to tar them up as relative pathnames as follows:

cd /
tar cvf /dev/rmt/0mn ./opt ./var ./work

Rgds,
Jeff

Re: TAR command

Vicente Sanchez_3 — Tue, 22 Oct 2002 15:24:40 GMT

Hi Mauro,

I don't know different sizes of directories, but perhaps you can try this:

%tar cvf /home/opt.tar /opt
compress /home/opt.tar
%tar cvf /home/var.tar /var
compress /home/var.tar
%tar cvf /home/work.tar /work
compress work.tar
%tar cvf /home/temp.tar /home/*.Z (files compressed)

Regards, Vicente.

Re: TAR command

Mauro_8 — Tue, 22 Oct 2002 17:43:26 GMT

Hi,

I agree with all but these way I am going to have a lot files in the tape instead of just one. With just one file I could set the day of the backup, for example, I want to have in the tape a file called 10_22_2002.tar that contains all the files that I did backup. It helps me if I need to restore some file.

Cheers,
Mauro

Re: TAR command

Darrell Allen — Tue, 22 Oct 2002 18:25:56 GMT

Hi Mauro,

To help identify the date the tar was written to the tape, you can do something like this:

cd /
DATEFILE=$(date +%m_%d_%Y)
touch $DATEFILE
tar cvf /dev/rmt/0m $DATEFILE ./opt ./var ./work
rm $DATEFILE

Whenever you want to see the date the tar was created, simply do:
tar tf /dev/rmt/0m | head -1

Running this today creates an empty file named 10_22_2002. It will be the first file on the tape and will be listed by the "tar tf /dev/rmt/0m | head -1" command.

This means your tar will contain an extra file (10_22_2002) but it's an empty file that shouldn't present a problem.

Darrell