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rated 0 times [ 81] [ 0] / answers: 1 / hits: 74338 / 2 Years ago, tue, april 12, 2022, 11:36:08

How can I use /dev/(u)random on Ubuntu or any *nix sistems?

I tried this but it says permission denied.

Note : I also tried as root.

/dev/(u)random

sudo /dev/(u)random

sudo -s; /dev/(u)random

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answered 2 Years ago zebrla · Accepted Answer

It's a file like device, so you can do things like cat it or copy from it. For instance:

dd if=/dev/urandom of=~/urandom_test count=4 bs=1024

Creates a file containing 4K of random bytes.

cat /dev/urandom > ~/urandom_test2

Will continue to write random bytes to that file until you hit Ctrl-C. Don't do this on a low performing system...

head -30 /dev/urandom > ~/urandom_test3

Will write 30 lines of random bytes