The other day I have also committed an update to the sync(8) manual page, which documents that running sync three times in a row hasn't been necessary since the 80s.
@mpts I use "sync;sync;sync" as a magic incantation ala "please" and "thank you". It doesn't actually mean anything, it's just part of the (social?) norms of a risky shutdown process.
I don't think I've ever stuck it in a script. I only ever used it as part of a process I wouldn't want to automate (to ensure human oversight).
Anyway, thanks, it's good to confirm how useless it is.
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