Why does this code hang Linux

Question

linux

Good time of the day.
Here in this topic , the author describes the "fork bomb"
and gives an example of code that "hangs" the server. Can anyone explain why the code
echo '. ./_&. ./_&'>_;. ./_
works this way.
Thank you.

Answer 1

this code writes a file _with content

. ./_&. ./_&

and runs it in the current shell (. filename). the file itself calls itself twice as a background job and so recursively.

Answer 2

It 's a fork bomb

Answer 3

Can you be more specific about which part of the code is responsible for what?

Answer 4

Try this one too:
: () { :|:& };:

Answer 5

Does not hang, but eats up all resources. The system actually works but is so slow that it seems to be hanging.
On systems with properly configured ulimits nothing will happen.