Re: how do I use gunzip with dd?

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On 9/22/19 10:33 PM, Ed Greshko wrote:
On 9/23/19 1:07 PM, ToddAndMargo via users wrote:
On 9/22/19 6:06 PM, Samuel Sieb wrote:
On 9/22/19 5:33 PM, ToddAndMargo via users wrote:
The same dd restored perfects to another stick.
I do believe want went wrong as the partition
structures not being written in the right places.
So gzip is out.  Rats!

Can you provide the exact commands you used?


# dd status=progress bs=4096 if=/dev/sdx of=DeadStick.FC30_$(date +%Y-%m-%d).dd.gz

???  Do you think that giving a file an extension of gz will automatically result in it being gzipped?

Booboo in my notes, now fixed.  Thank you!


# dd status=progress bs=4096 if=/dev/sdg of=DeadStick.FC30_$(date +%Y-%m-%d).dd.gz

# file DeadStick.FC30_2019-09-23.dd.gz
DeadStick.FC30_2019-09-23.dd.gz: DOS/MBR boot sector; partition 1 : ID=0x83, start-CHS (0x4,4,1), end-CHS (0x3ff,254,2), startsector 2048, 15685632 sectors

It isn't gzipped.

Have to then

# mv DeadStick.FC30_2019-09-23.dd.gz DeadStick.FC30_2019-09-23.dd
# gzip DeadStick.FC30_2019-09-23.dd

# file DeadStick.FC30_2019-09-23.dd.gz
DeadStick.FC30_2019-09-23.dd.gz: gzip compressed data, was "DeadStick.FC30_2019-09-23.dd", last modified: Mon Sep 23 05:24:19 2019, from Unix, original size 3737124864

and now it is.


# gunzip --to-stdout backup.date.dd.gz | dd status=progress bs=4096 of=/dev/sdx

???

You've created a file named one thing and are using a different name?

It was from my notes.

And, if your file wasn't gzipped and you tried to ungzip it you'd get

# gunzip DeadStick.FC30_2019-09-23.dd.gz

gzip: DeadStick.FC30_2019-09-23.dd.gz: not in gzip format

So, did you really provide the "exact" commands you used?



Digging through my history (which I did not think I still had):


# dd status=progress bs=4096 if=/dev/sdb | gzip -v > DeadStick.FC30_$(date +%Y-%m-%d).dd.gz

This is a 64 GB stick.  It compressed down to 4 GB,
which made senses most of the stick is zeros

# gunzip --to-stdout DeadStick.FC30_2019-09-06.dd.gz | dd status=progress bs=4096 of=/dev/sdb

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