[fedora] dd

[xinyou yan]

2011/9/4 Aaron Konstam <akonstam at sbcglobal.net>:
> On Sat, 2011-09-03 at 22:08 +0800, xinyou yan wrote:
>> 2011/9/3 Chris Tyler <chris at tylers.info>:
>> > On Sat, 2011-09-03 at 20:36 +0800, xinyou yan wrote:
>> >> I want to make sure one thing .
>> >> Can I use tar to pack the file created by dd.
>> >> I found use           tar -rf xx.tar yyy.dd
>> >> can't make the file into the tar file .
>> >
>> > It depends on what is in the dd file and what you're trying to do.
>> >
>> > I assume that the dd file is a direct copy of a filesystem (for example,
>> > "dd if=/dev/sda2 of=yyy.dd" assuming that /dev/sda2 is a filesystem
>> > partition).
>> >
>> > If you simply want to reduce the size of the dd file, use gzip:
>> >  gzip yyy.dd # produces yyy.dd.gz
>> >
>>
>> I want it be compressed by gzip,
>> and the gzip files to a archive file (such as tar file)
>> Howerver gzip file can't be add to a tar file  (-r)
>>
>> > If you want to create a tar archive of the individual files within the
>> > dd image, you will have to mount the dd file first using the loopback
>> > option:
>> >  mkdir /tmp/yyy
>> >  mount -o loop yyy.dd /tmp/yyy
>> >  cd /tmp
>> >  tar cvf xx.tar yyy
>>
>> That's mean tar must taring a regular file or directory .
>> I wonder .  why must tar  the yyy (directory)
>>
>> you mean mount to a directory , and tar the directory ?
>>
>>
>> What I want 's just a archive file that contain some sigle dd files .
>>
>> thank you .
>>
>> You mail help me understand more
>>
> I am not sure what you want to do,, but if you have a gziped tar file
> and you  want to add another file to it this should work:
> If your archive is archive.tgz
> Uncompress archive: gunzip archive.tgz
> Add a another file : tar -rf archive.tar second_file
> Compress the archive: gzip archive.tar

Yes it can achieve my work,
However , I just can't undestand , tar -rf xx.tar yyy.dd to a regular
file tar ( can 't  add the size)
And When i tar -xf xx.tar. It will give a  error message : tar:
Unexpected EOF in archive

> This will recreate a new archive.gz file with the second file added.
By the way ,it will take many times to do it.

> and so on.
>
> This procesws could be automates by a bash script.
>
> --
> =======================================================================
> Reality always seems harsher in the early morning.
> =======================================================================
> Aaron Konstam telephone: (210) 656-0355 e-mail: akonstam at sbcglobal.net
>
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