Re: [PATCH v2 1/1] t0003: Call dd with portable blocksize

From: Junio C Hamano <gitster@pobox.com>
Date: Jan 22, 2023, 16:21 UTC
Message-ID: <xmqqtu0isfom.fsf@gitster.g>
In-Reply-To: <20230122062839.14542-1-tboegi@web.de>

tboegi@web.de writes:

> From: Torsten Bögershausen <tboegi@web.de>
>
> The command `dd bs=101M count=1` is not portable,
> e.g. dd shipped with MacOs does not understand the 'M'.

Very good piece of information to have here.

> Use `bs=1048576 count=101`, which achives the same, instead.

I'd locally tweak (read: no need to resend) it to

    Use `dd bs=1048576 count=101`, which ...

and downcase "Call" on the title line.

A tangent.  I wonder how portable

    dd bs=1024x1024 count=101
    dd bs=1kx1k count=101

are in practice. "Two or more positive decimal numbers (with or without 'k' or 'b') separated by 'x', specifying the product of the indicated values" is from POSIX, but I haven't used it myself (I know GNU dd groks it).

In any case, thanks for the update.