如何：(){：AC.26：&}；：works

Question

可能重复： 这个叉子炸弹是怎么工作的？

嗨,

快速提问。

这个shell命令是如何工作的，为什么它获得了高达100%的cpu使用量？

: ( ) { : | : & } ; :

Answer 1

这是一个叉形炸弹

Answer 2

以下是维基百科(炸弹)的简短解释：

:()      # define ':' -- whenever we say ':', do this:
{        # beginning of what to do when we say ':'
    :    # load another copy of the ':' function into memory...
    |    # ...and pipe its output to...
    :    # ...another copy of ':' function, which has to be loaded into memory
         # (therefore, ':|:' simply gets two copies of ':' loaded whenever ':' is called)
    &    # disown the functions -- if the first ':' is killed,
         #     all of the functions that it has started should NOT be auto-killed
}        # end of what to do when we say ':'
;        # Having defined ':', we should now...
:        # ...call ':', initiating a chain-reaction: each ':' will start two more.

基本上是一个递归函数，每次重复调用都会产生两个进程。因此，过程的数量呈指数增长。