this post was submitted on 07 May 2025
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[–] riwo@lemmy.blahaj.zone 59 points 2 days ago (3 children)

what does it do? (no i am not trying it on my machine)

[–] Delta_V@lemmy.world 141 points 2 days ago (3 children)

This is a Bash fork bomb, a malicious function definition that recursively calls itself:

:() — defines a function named : (yes, just a colon).

{ [:|:&] } — the function's body:

    :|: — pipes the output of the function into another call of itself, creating two processes each time.

    & — runs the call in the background, meaning it doesn’t wait for completion.

; — ends the function definition.

: — finally, this invokes the function once, starting the bomb.
[–] coacoamelky@lemm.ee 20 points 2 days ago

From a fish user I appreciate this

[–] celeste@feddit.org 13 points 2 days ago (1 children)

thx, I think I get it, it's do it's as many processes as your computer will run until it crashes

[–] Delta_V@lemmy.world 10 points 2 days ago

yeah, pretty much

[–] baduhai@sopuli.xyz 3 points 2 days ago (2 children)

Why are the square brackets there?

[–] Peruvian_Skies@sh.itjust.works 4 points 2 days ago (1 children)

There aren't any square brackets.

The form "function(){content}" in bash defines a function called "function" that, when called by name, executes "content". This forkbomb defines a function called : (just a colon) which calls itself twice in a new subprocess (the two colons inside the curly brackets). It thus spawns more and more copies of itself until it overwhelms your processor.

[–] baduhai@sopuli.xyz 4 points 1 day ago* (last edited 1 day ago)

I understood, it's just that @Delta_V@lemmy.world added square brackets to his explanation.

{ [:|:&] } — the function's body:

[–] Delta_V@lemmy.world 1 points 1 day ago

because I didn't know what it did either, then made a typo in the ChatGPT prompt when asking about it

[–] tetris11@lemmy.ml 62 points 2 days ago* (last edited 2 days ago) (2 children)
function tombombadil() {
   tombombadil | tombombadil & 
}
tombombadil()

Each time it calls itself, it forks a background copy too and sends Gandalf deeper into the abyss

[–] riwo@lemmy.blahaj.zone 7 points 2 days ago

sounds likr there is some crazy lotr lore behind this

[–] cupcakezealot@lemmy.blahaj.zone 3 points 2 days ago* (last edited 2 days ago) (1 children)

so basically

10 print welcome to hell

20 goto 10

30 end

[–] chaos@beehaw.org 10 points 2 days ago

It's worse, a single infinite loop will warm up the computer a bit, this program starts two copies of itself, each of which starts two copies of itself... unless you've set some limits on things the computer's going to be locked up within seconds.

[–] bdonvr@thelemmy.club 55 points 2 days ago (1 children)

It just takes all your computers CPU and RAM by making endless copies of itself. Best case your PC gets sluggish, worst it crashes. Won't do any lasting damage. It's called a "Fork Bomb"

[–] superkret@feddit.org 7 points 2 days ago

Any modern Linux system where you didn't explicitly tell it to do otherwise will limit the amount of running processes to a safe number.
So this does nothing anymore. Same as rm -rf / which also simply triggers an error message.