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

submitted 1 month ago* (last edited 1 month ago) by A_norny_mousse@feddit.org to c/linux@programming.dev

36 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~~ is static, and some tweakable parameters.

❤️🐧

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[-] victorz@lemmy.world 9 points 1 month ago* (last edited 1 month ago)

cat /proc/sys/kernel/random/uuid > /dev/null

[-] Hamartiogonic@sopuli.xyz 1 points 1 month ago

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 3 points 1 month ago* (last edited 1 month 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

[-] Hamartiogonic@sopuli.xyz 1 points 1 month ago

Oh yeah. This looks like a much better way to do it. My solution is pretty bare bones by comparison.

[-] lime@feddit.nu 1 points 1 month ago

the advantage of yours is that you can actually see the performance number afterwards.

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this post was submitted on 24 May 2025

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