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Home/ Questions/Q 8850749
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Editorial Team
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Editorial Team
Asked: June 14, 20262026-06-14T12:58:25+00:00 2026-06-14T12:58:25+00:00

If you run a .bat or .cmd file with %0|%0 inside, your computer starts

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If you run a .bat or .cmd file with %0|%0 inside, your computer starts to use a lot of memory and after several minutes, is restarted. Why does this code block your Windows? And what does this code programmatically do? Could it be considered a “bug”?

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  1. Editorial Team
    Editorial Team
    2026-06-14T12:58:26+00:00Added an answer on June 14, 2026 at 12:58 pm

    This is the Windows version of a fork bomb.

    %0 is the name of the currently executing batch file. A batch file that contains just this line:

    %0|%0
    

    Is going to recursively execute itself forever, quickly creating many processes and slowing the system down.

    This is not a bug in windows, it is just a very stupid thing to do in a batch file.

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