RE: Byte-order in od -x (Win2K)
On Tue, 28 Jun 2005, Dave Korn wrote: Probably TITTTL material, but... > Now, I'd certainly agree that short int is a strange default for od (as > indeed is octal, which it defaults to if you don't specify a base > explicitly); Why would octal be a strange default for a program called "octal dump"? ;-) > but it's not 'strange' and nothing is 'transposed', it's simply > correct-albeit-unexpected behaviour. HTH, Igor -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_[EMAIL PROTECTED] ZZZzz /,`.-'`'-. ;-;;,_[EMAIL PROTECTED] |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! "The Sun will pass between the Earth and the Moon tonight for a total Lunar eclipse..." -- WCBS Radio Newsbrief, Oct 27 2004, 12:01 pm EDT -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
RE: Byte-order in od -x (Win2K)
Original Message
>From: Fergus Daly
>Sent: 28 June 2005 15:45
>
> ("od -x .." outputs the strange transposition of bytes that you have
> referred to.)
It's not a 'transposition of bytes'. It's not bytes at all; "od -x"
defaults to reading 16-bit short integers, and outputs them in host-endian
order. It's completely correct. "od -x" is the same as "od -x2" which is
different from "od -x1" which is what the OP really wanted in the first
place.
Now, I'd certainly agree that short int is a strange default for od (as
indeed is octal, which it defaults to if you don't specify a base
explicitly); but it's not 'strange' and nothing is 'transposed', it's simply
correct-albeit-unexpected behaviour.
cheers,
DaveK
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Re: Byte-order in od -x (Win2K)
>> Exactly the other way round ...
~> echo abcd | od -tx1
000 61 62 63 64 0a
005
is nice; and, for some purposes
~> echo abcd | od -An -tx1
61 62 63 64 0a
(or "od -An -tx1 ") is nicer still.
("od -x .." outputs the strange transposition of bytes that you have
referred to.)
Fergus
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Re: Byte-order in od -x (Win2K)
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 According to Andreas Eibach on 6/28/2005 7:36 AM: > Well, looks like a feature or a bug. :)) Feature. > > $ ls -hog CD0.dat > > -rw-r--r-- 1 0 Jun 28 14:46 CD0.dat > (minus r; w minus; r minus; minus r; minus minus) > > > and now ... > > $ ls -hog CD0.dat | od -x > > 722d 2d77 2d72 722d > > Definitely wrong byte order. Well, what do you expect on a little-endian machine, when you are passing characters to od in big-endian order? > Can that be tweaked somehow? Yes - try "od --help" to see other display formats. For example, "od -t x1" prints hex bytes one at a time, with no endianness issues. Or try "ls - -hog | dd conv=swab status=noxfer | od -x", with that dd in the middle doing a byte-swap. - -- Life is short - so eat dessert first! Eric Blake [EMAIL PROTECTED] -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.0 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCwVUz84KuGfSFAYARAj2CAKChJGQyLRGyaxIiwyGTIqcA/cthpgCg0/4S w5fxo4Tn1ez3ipIVoRbATfE= =jW4d -END PGP SIGNATURE- -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
Byte-order in od -x (Win2K)
Well, looks like a feature or a bug. :)) $ ls -hog CD0.dat -rw-r--r-- 1 0 Jun 28 14:46 CD0.dat (minus r; w minus; r minus; minus r; minus minus) and now ... $ ls -hog CD0.dat | od -x 722d 2d77 2d72 722d Definitely wrong byte order. In human readable format: (r minus; minus w; minus r; r minus; minus minus) Exactly the other way round. Can that be tweaked somehow? Well, I cannot believe this is really intention ... (OS Win2000 + sp4) -Andreas _ Mit der Gruppen-SMS von WEB.DE FreeMail können Sie eine SMS an alle Freunde gleichzeitig schicken: http://freemail.web.de/features/?mc=021179 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
