topic Re: tar question in Operating System - HP-UX

tar question

Sanjay Tailor — Wed, 21 Jun 2000 16:18:26 GMT

Hello,
I have a tar file and would like to restore it. i use the command tar -xv. But this tries to restore it to the original location. Can I tell tar to restore the files to another location (directory) on the system?

Thank you for your help.

Re: tar question

Rick Garland — Wed, 21 Jun 2000 16:22:07 GMT

tar -xvC I believe is the option you are looking for.

man tar to find the options you would need

Re: tar question

Sanjay Tailor — Wed, 21 Jun 2000 16:32:33 GMT

Hello,
That option did not work. I tried that and looked at the man page and there is no reference to restoring to a specified directory or none that I could find.

Thanks,

Re: tar question

CHRIS_ANORUO — Wed, 21 Jun 2000 16:41:39 GMT

Use tar -exvf, tar restores from you stand point when issueing the extract command.

Re: tar question

Fred Martin_1 — Wed, 21 Jun 2000 16:45:09 GMT

If you get a listing of the files, does it show them with absolute pathnames, starting with a slash? If so, tar will always attempt to restore to original locations. If the pathnames are relative, ie starting with a dot or filename, the restore begins at the current directory.

Re: tar question

Richard Lathom — Wed, 21 Jun 2000 16:49:50 GMT

Can't be done. Tar will do two(2) things depending on the way the tarball was created.
Do a "tar -tvf" and capture the output. If the filenames begin ./ , then the restore will be relative to the directory you are in when doing the "un-tar". If the filenames begin with / , then the restore will always be relative to /(root). You can't change this behaviour. Tar is an old utility but useful because all unix OSes have it.

Richard Lathom

Re: tar question

Sanjay Tailor — Wed, 21 Jun 2000 16:54:12 GMT

Hello,

Just as I had surmised. So, when I create the tar how do I create it to use relative file names? My tar right now has absolute paths in it.

Thanks,

Re: tar question

Andy Monks — Wed, 21 Jun 2000 17:20:58 GMT

Hi Sanjay,

Firstly, you can recover your existing tar backups. You can use 'pax'. It can recover absolute tar backups, relatively.

To do you tar back relative do :-

tar cvf /dev/rmt/0m ./etc ./usr

or

tar cvf /dev/rmt/0m .

which will backup everything from where your current directory is.

The important thing is to being everything with './'

Andy

Re: tar question

Alan Riggs — Wed, 21 Jun 2000 17:27:49 GMT

If the tar file was created with relative pathing (always recommended) then simply go to the directory under which you want teh files restored and use tar xvf.

ex:
cd /where/I/want/it
tar vxf /wpath/to/tar/file

If the tar was created using absolute paths, I do not believe there is a way to override it in the tar command.

Re: tar question

Carlos Fernandez Riera — Thu, 22 Jun 2000 08:06:27 GMT

Pax command allows conversion of absolute paths to relative paths using -s option. Pax can read tar files.

This is the only way i know in HP-UX...

but in a SCO you can do tar xvfA. 'A' option converts form absolute to relative paths.

Well, when i must do this in HP-UX i use symbolic links:

if i must restore files under /dir/data:

mv /dir/data /dir/data.o
mkdir /tmp/data
ln -s /tmp/data /dir/data
tar xvf ....
rm /dir/data
mv /dir/data.o /dir/data

So i can extract to /tmp.

HTH

Re: tar question

Andreas Voss — Thu, 22 Jun 2000 10:02:41 GMT

Hi all,

i think the best solution is to use pax:

pax -rv -s'/^BACKSLASH///'
This will restore the archive into the current directory (look out for pwd).

I have noticed that the Backslash is not submitted by the reply so i have written it symbolic (BACKSLASH). Of course you must use the Backslash key by entering the command.

Greetings

Andrew

Re: tar question

Fred Martin_1 — Mon, 26 Jun 2000 18:41:56 GMT

Did you get the answer to your question about creating tar files with relative pathnames?

You just 'cd' to the directory where you want the tar to begin. For example, if you have the following:

/usr/local/bin/etc....

If you want to tar everything in bin, including the bin directory:

cd /usr/local
tar cvf tarfile

The files in the tarfile will look like this:

bin/script1
bin/script2
bin/data

...etc

Then you can restore it anywhere you like:

cd /home/fred
tar xvf tarfile

...will create a 'bin' directory under 'fred'

Re: tar question

Fred Martin_1 — Mon, 26 Jun 2000 18:46:29 GMT