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cat /proc/sys/kernel/random/uuid [I ❤️ Linux] (feddit.org)

submitted 18 hours ago by A_norny_mousse@feddit.org to c/linux@programming.dev

14 comments fedilink hide all child comments

That's all. I just found this in a random script. Generates a random UUID every time it's called. I didn't know.

Of course I can also use uuidgen or pipe /dev/(u)random into something to get a random alphanumeric string - but this is built right into the kernel!

In /proc/sys/kernel/random/, there's also boot_id which seems to do the same, and some tweakable parameters.

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[–] Hamartiogonic@sopuli.xyz 1 points 8 hours ago (2 children)

That reminds me of the CPU stress test I ran many years ago.

dd if=/dev/random of=/dev/null

If you have 8 cores, just open 8 terminals, and run that code in each of them.

[–] lime@feddit.nu 2 points 8 hours ago* (last edited 8 hours ago)

for i in {1..n}  # where n == number of cores
do
  dd if=/dev/urandom of=/dev/null &
done

# to stop:
jobs -p | xargs kill

[–] YerbaYerba@lemm.ee 2 points 8 hours ago

/dev/urandom should stress the CPU more. /dev/random can be entropy limited