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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Shutdown - 25 Years Later
Date: Fri, 18 Apr 2025 08:16:59 -0000 (UTC)
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On Fri, 18 Apr 2025 08:53:05 +0100, Andy Burns wrote:

> I don't remember if I ever used  sync; sync; halt
> 
> on linux, but certainly on older *nixes

The need for multiple “sync” calls was a bit of voodoo black magic 
leftover from a bug/misfeature in early Unix kernels.

I don’t think it’s ever been necessary on Linux.