[TUHS] PDP-7 UNIX filesystem

Michael Kjörling michael at kjorling.se
Sat Oct 26 07:08:04 AEST 2019

On 23 Oct 2019 21:23 -0500, from mparson at bl.org (Michael Parson):
>>>> dd is deprecated?  I'm surprised. I use it all the time.
>>> I don't think so. A quick google search doesn't support that.
>> dd isn't deprecated. There's no heir apparent, it's in POSIX.1 and
>> there's no advantage to changing. There's not even been talk of that,
>> at east in *BSD land.

The only thing resembling "deprecation" of dd that I'm aware of is the
recommendation I saw many years ago to not use it to copy potentially
problematic storage media (for data recovery), but to use ddrescue for
that purpose instead. The reason for this is that with conv=noerror
(without which it'd simply abort if it encounters an I/O error), dd
would simply skip past data in the input that it can't read, but not
adjust any offsets in the output, which wreaks havoc with anything
where offsets matter (such as in file system metadata).

> I'm sure the systemd people are eyeballing it.

That wouldn't surprise me in the slightest.

Michael Kjörling • https://michael.kjorling.semichael at kjorling.se
  “The most dangerous thought that you can have as a creative person
              is to think you know what you’re doing.” (Bret Victor)

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