Re: dd errors with certain DVDs

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On 27Mar2007 16:54, Tony Nelson <tonynelson@xxxxxxxxxxxxxxxxx> wrote:
| dd if=/dev/dvd bs=2048 count=$(isosize -d 2048 /dev/dvd) | sha1sum

isosize is a binary! Ugh. The man page doesn't say: does it do anything
more than my (fixed) "ls|awk" incantation?

Anecdote on bloat: I the good old days, /bin/true was an empty executable
file, (i.e. a zero length shell script, which trivially succeeded). To
my horrow, on the first real BSD system I used (SunOS 4) it was a shell
script consisting of a comment containing the BSD copyright notice. Some
years later on an AIX box I found than every thing had become worse;
it was a binary!

So I'm wondering, is isosize a ludicrous piece of implementation overkill, or
is it doing something special?
-- 
Cameron Simpson <cs@xxxxxxxxxx> DoD#743
http://www.cskk.ezoshosting.com/cs/

As a method of sending a missile to the higher, and even to the highest parts
of the earth's atmospheric envelope, Professor Goddard's rocket is a
practicable and therefore promising device.  It is when one considers the
multiple-charge rocket as a traveler to the moon that one begins to doubt ...
for after the rocket quits our air and really starts on its journey, its
flight would be neither accelerated nor maintained by the explosion of the
charges it then might have left.  Professor Goddard, with his "chair" in
Clark College and countenancing of the Smithsonian Institution, does not know
the relation of action to re-action, and of the need to have something better
than a vacuum against which to react ... Of course he only seems to lack
the knowledge ladled out daily in high schools.
        - New York Times Editorial, 1920


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