"dd conv=unblock cbs=80 "
Mike McNamara
mac at esl.UUCP
Sat Jul 23 09:42:33 AEST 1988
People have noted that HP-UX does not document the block/unblock
conversion options in dd.
Our system (CYDROME) is also a system V R3 derivitive, and since
I was educated :-) on berkeley systems, I would always just type out
dd if=/dev/rmt0 ibs=64k cbs=80 conv=unblock to read blocked tapes, until
one day a guy complained that he couldn't read such a tape, cause there
where no newlines. I told him, "use dd; type <the above>; its in the man
page."
It isn't in any ATT man page.
/bin/dd never read the man page, and fully supports the undocumented
cbs and conv=unblock/block options.
So many companies license Unix from AT&T or berkeley, and just run
the man pages through sed -e 's/AT&T/Tadpole Computer/' , and ship it.
(It can be quite humerous to see man pages talking about "The -6 switch
allows tar to read Tadpole Computer Version 6 tapes" :-)
I guess the only trustworthy documentation is in the source :-)
-mac
--
Michael Mc Namara
Cydrome Incorporated
ARPA: esl!cydrome!mac at ames.arpa
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