How to extract a 7z file to device /dev/sda with pipe ?

openbsd98324 · 11-01-2023, 01:15 PM

Hello,

How to use 7zr x to pipe to dev? i.e. How to extract a 7z file to device /dev/sda with pipe ?

Example:

Code:

7zr x myfile-operating-system-sda.img.7z -so > /dev/sda ??

thank you and kind regards

teckk · 11-01-2023, 06:05 PM

From man 7zr:

Code:

Backup and limitations
       DO NOT USE the 7-zip format for backup purpose on Linux/Unix because :
        - 7-zip does not store the owner/group of the file.

See:

Code:

man 7zr

I would say that you should extract that image file. Then use dd to write it to device node.

Code:

dd if=myfile-operating-system-sda.img of=/dev/sda bs=1M

Everything on sda will be overwritten.

syg00 · 11-01-2023, 08:16 PM

That implies everything on the backup already taken will be useless. Take another backup with something that understands *nix - maybe clonezilla for the entire device.

lvm_ · 11-02-2023, 12:22 AM

You should put switches before file names - "7z x -so filename > file", and all will be fine. Disregard previous messages, they do not apply in your case - people are being inattentive.