Compress after copy with dd?

miros84 · 02-11-2010, 12:25 PM

I copy my partition with this command

Code:

 dd if=/dev/sdb2 of=/home/sam/partition.image bs=4096 conv=notrunc,noerror

But I would like to compress at the same time.
So, the output file to be some rar or zip ot tar.gz file.
Is that possible?

rweaver · 02-11-2010, 12:27 PM

Instead of specifying an outfile pipe it to bzip2 and redirect it.

eg:

Code:

dd if=/dev/sdb2 bs=4096 conv=notrunc,noerror | bzip2 > /home/sam/partition.image.bz2

miros84 · 02-11-2010, 01:08 PM

I tried it bit it doesnot work.

I recive this

Code:

0+0 records out
0 bytes (0 B) copied, 29,6211 s, 0,0 kB/s
dd: leyendo «/home/miros/facturación»: Es un directorio
0+0 records in
0+0 records out
0 bytes (0 B) copied, 29,6212 s, 0,0 kB/s
dd: leyendo «/home/miros/facturación»: Es un directorio
0+0 records in
0+0 records out
0 bytes (0 B) copied, 29,6212 s, 0,0 kB/s
dd: leyendo «/home/miros/facturación»: Es un directorio
^C records out
0 bytes (0 B) copied, 29,6333 s, 0,0 kB/s
0+0 records in
0+0 records out
0 bytes (0 B) copied, 29,6483 s, 0,0 kB/s

Other ideas?

David1357 · 02-11-2010, 01:48 PM

Quote:

Originally Posted by miros84

Other ideas?

Try

Code:

sudo dd if=/dev/sdb2 bs=4096 conv=notrunc,noerror | bzip2 > /home/sam/partition.image.bz2

If that does not work, what is the output of "fdisk -l"?

miros84 · 02-11-2010, 02:36 PM

I think I confused you.

I wanted to do that:

Code:

dd if=/home/miros/facturación/ of=/home/miros/opiti/partition.image bs=4096 conv=notrunc,noerror

I didnot want to copy a partition, I want to copy a directory.
I do it as root.

Trying to copy a partition, it works, but trying to copy a directory is when it doesnot work.

rweaver · 02-11-2010, 02:46 PM

Why would you dd a directory instead of using a tool more suited to that operation? dd really shouldn't be used as a multipurpose copying tool even though it can be shoe horned into that role.

Code:

tar cfvj /home/miros/opiti/backup.tbz2 /home/miros/facturación/*

David1357 · 02-11-2010, 03:09 PM

Quote:

Originally Posted by miros84

I think I confused you.

I think you confused yourself. Here is the first line of your original post:

Quote:

Originally Posted by miros84

I copy my partition with this command

miros84 · 02-13-2010, 01:04 PM

Yeah, you are right.
I confused myself and you.
So, it is impossible to copy folder with dd?

teckk · 02-13-2010, 01:22 PM

If all you are looking to do is copy a folders contents and compress it then why don't you use the cp or tar commands or both.

Code:

cp /path/to/folder/ /path/to/new/folder/newname

You end with a slash and it'll get just the contents and not the folder. Then you can update the new folder as the old folder changes with something like

Code:

cp -nR /path/to/folder/ /path/to/new/folder

Put quotes around the entire path if the file or folder contains non standard characters like spaces or ?

Code:

cp -nR "/path/to/folder/" /path/to/new/folder

dd is a bitstream duplicator. It will duplicate anything you point it to.
It copies 1 and 0 in the exact order and place where they were. That's why it is good for an exact .iso of something.

jefro · 02-13-2010, 04:08 PM