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Tem2	02-11-2019 08:53 PM

Permission denied using sudo dd command with pv

Trying to use dd command (my first effort with this command) to back up my system partition to a separate partition on the same hard disk.

sudo dd if=/dev/sda1 | pv | dd of=/dev/sda3
dd: failed to open '/dev/sda3': Permission denied
0 B 0:00:00 [ 0 B/s] [<=>

It runs ok without the pv option:
sudo dd if=/dev/sda1 of=/dev/sda3

MadeInGermany

02-11-2019 09:23 PM

The sudo ends at the pipe.
Either have two sudos:

Code:

sudo dd if=/dev/sda1 | pv | sudo dd of=/dev/sda3

Or pass the piped commands to a root shell (then even the pv runs as root)
as an argument

Code:

sudo sh -c "dd if=/dev/sda1 | pv | dd of=/dev/sda3"

or from stdin

Code:

echo "dd if=/dev/sda1 | pv | dd of=/dev/sda3" | sudo sh

Bash also takes

Code:

sudo sh <<< "dd if=/dev/sda1 | pv | dd of=/dev/sda3"

Tem2	02-11-2019 11:01 PM

Quote:

Originally Posted by MadeInGermany (Post 5960837)

The sudo ends at the pipe.
Either have two sudos:

Code:

sudo dd if=/dev/sda1 | pv | sudo dd of=/dev/sda3

Or pass the piped commands to a root shell (then even the pv runs as root)
as an argument

Code:

sudo sh -c "dd if=/dev/sda1 | pv | dd of=/dev/sda3"

or from stdin

Code:

echo "dd if=/dev/sda1 | pv | dd of=/dev/sda3" | sudo sh

Bash also takes

Code:

sudo sh <<< "dd if=/dev/sda1 | pv | dd of=/dev/sda3"

Thanks! I used 2 sudos.

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