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How to Display dd Progress and dd.sh Script

February 12th, 2013 Leave a comment Go to comments

Upgrading software on Linux / Android boards or devices often involves copying images to an SD card or microSD. In Linux, you’d usually do that with dd, a utility that provides binary copy of data to files or block devices. A typical command would be:

sudo dd if=new_firmware.bin of=/dev/sdc

However, during the copy, dd does not show a progress bar by default. But dd actually supports progress report, as indicated in the manpage: you can run dd, and send USR1 signal to display the current progress once, and resume copying. Linux commando explains how to continuously return the progress. First run the dd command:

sudo dd if=/dev/random of=/dev/null bs=1K count=100

Open another terminal window to find out the process id:

pgrep -l '^dd$'
10152 dd

And use the watch command to send USR1 at regular interval.

watch -n 10 sudo kill -USR1 10152

You should see dd progress in the first window every 10 seconds. It works, but the output is not very nice because dd will just output 3 lines at a time, and you’ll see something like:

3252612+0 records in
3252612+0 records out
3330674688 bytes (3.3 GB) copied, 12.9668 s, 257 MB/s
3872256+0 records in
3872256+0 records out
3965190144 bytes (4.0 GB) copied, 23.1629 s, 171 MB/s

I’ve recently come across a script (dd.sh) that handles all those steps for you, and display the progress nicely. First download it, and install it in your path:

wget http://shellscripts.org/dl/projects/d/ddprogress/version_2/dd.sh
sudo cp dd.sh /usr/local/bin
sudo chmod 755 /usr/local/bin/dd.sh

Then use it just as you would with dd:

sudo dd.sh if=/dev/sdc of=test.img bs=1M
Getting blocksize from '/dev/sdc': 7744512
In: 781M (8M/sec) - Out: 781M (8M/sec) ETA: 00:03:20

The last line is updated regularly, and shows transfer rate, as well as the estimated time to completion.

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  1. LieDanG
    February 12th, 2013 at 15:58 | #1

    Or you can just use dcfldd instead dd

  2. Alex
    February 12th, 2013 at 17:37 | #2

    Useful!! Thx

  3. February 12th, 2013 at 19:54 | #3

    With pv:

    zoobab@buzek /home/zoobab [11]$ dd if=/dev/zero |pv|dd of=/dev/null bs=1M count=1000000
    dd: warning: partial read (60416 bytes); suggest iflag=fullblock
    ^C2419864+0 records iniB/s] [ ]

  4. February 12th, 2013 at 23:57 | #4

    @zoobab: +1 I just pipe through ‘pv’.

  1. February 21st, 2013 at 21:20 | #1