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Re: From Anxious StsAdmi: dd does't work with tape drive?????
From: |
Paul Eggert |
Subject: |
Re: From Anxious StsAdmi: dd does't work with tape drive????? |
Date: |
Mon, 23 Dec 2002 00:19:40 -0800 (PST) |
> Date: Sun, 22 Dec 2002 11:41:00 -0700
> From: address@hidden (Bob Proulx)
>
> Reading the documentation it says that bs overrides both ibs and obs.
> I could use an education here. Could you enlighten me as to how
> setting obs only solves the problem when setting bs, which overrides
> obs, does not? What is the behavior of dd when ibs is not set that is
> changed by having it set?
It is a bit tricky, but more details can be found in:
http://www.opengroup.org/onlinepubs/007904975/utilities/dd.html
The GNU documentation could be better, I suppose. Also there are
undoubtedly some POSIX conformance problems, e.g. POSIX says that
"bs=1024 ibs=512" is equivalent to plain "bs=1024", but from code
inspection this doesn't seem to be true for GNU dd.
> That should be 'swap' not 'swab'.
No, "swab" is right. It's short for "swap bytes".