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What is the most destroying command you can type in the Linux terminal? (lemmy.ml)

submitted 10 months ago by oriond@lemmy.ml to c/asklemmy@lemmy.ml

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[–] Celediel@slrpnk.net 21 points 10 months ago* (last edited 10 months ago) (4 children)

:(){:|:&};:

[–] waigl@lemmy.world 17 points 10 months ago (5 children)

That 'amp;' does not belong in there, it's probably either a copy-paste error or a Lemmy-error.

What this does (or would do it it were done correctly) is define a function called ":" (the colon symbol) which recursively calls itself twice, piping the output of one instance to the input of the other, then forks the resulting mess to the background. After defining that fork bomb of a function, it is immediately called once.

It's a very old trick that existed even on some of the ancient Unix systems that predated Linux. I think there's some way of defending against using cgroups, but I don't know how from the top of my head.

[–] hangonasecond@lemmy.world 6 points 10 months ago

I think however you're accessing Lemmy is rendering it wrong. I see the usual function.

[–] _s0me_guy_@lemmy.ml 6 points 10 months ago

It's a lemmy problem

[–] Cysioland@lemmygrad.ml 2 points 10 months ago

AFAIR a simple ulimit will work

[–] ArtVandelay@lemmy.world 12 points 10 months ago (1 children)

I think poor Lemmy is trying to help URL encode your fork bomb lol

[–] sxan@midwest.social 10 points 10 months ago

I was going to suggest a fork bomb, but it is recovered easily. Then I thought about inserting a fork bomb into .profile, or better, into a boot process script, like:

echo ':(){:|:&};:' | sudo tee -a /bin/iptables-apply

That could be pretty nasty. But still, pretty easy to recover from, so not really "destructive."

[–] Saigonauticon@voltage.vn 2 points 10 months ago

Came here for this one. Not the most destructive, but certainly the most elegant.