Watch the progress of 'dd'

dd if=/dev/urandom of=file.img bs=4KB& pid=$!
Running this code will execute dd in the background, and you'll grab the process ID with '$!' and assign it to the 'pid' variable. Now, you can watch the progress with the following: while true; do kill -USR1 $pid && sleep 1 && clear; done The important thing to grasp here isn't the filename or location of your input or output, or even the block size for that matter, but the fact that you can keep an eye on 'dd' as it's running to see where you are at during its execution.

By: atoponce
2009-04-08 05:56:47

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What Others Think

Alternatively, if you have 'pv' installed: pv /dev/urandom | dd of=file.img bs=4KB count=1234 This will display a progress bar for fixed-size input, or just a throughput speed for unlimited things like urandom.
flatcap · 653 weeks and 6 days ago
dd if=/dev/urandom |cpipe -vt| dd of=file.img
oernii · 653 weeks and 6 days ago
pv: cpipe: (for the less observant) The trick here is that sending 'dd' the USR1 signal causes it to print the latest transfer statistics.
bwoodacre · 653 weeks and 6 days ago
hey thx for reminding me to create alias of this #ddp dd_args function ddp() { dd "$@" & pid=$! && while true; do kill -USR1 $pid && sleep 1 && clear; done ;}
professoralex · 648 weeks and 6 days ago
You could use watch -n1 "kill -USR1 $pid" instead of the sleep and clear in a for loop.
stuart · 626 weeks and 5 days ago
Well... i think oernii had it. I wouldn't call him less observant, but rather more. The kill -USR1 isn't needed, and pv does work. For example, copying a hdd pv /dev/sda |dd of=/dev/sdb Works perfectly
darkdragn · 578 weeks and 4 days ago

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Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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