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devel / comp.unix.shell / Re: About the big-endian and little-endian.

SubjectAuthor
* About the big-endian and little-endian.hongy...@gmail.com
`* About the big-endian and little-endian.Janis Papanagnou
 `- About the big-endian and little-endian.hongy...@gmail.com

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About the big-endian and little-endian.

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Subject: About the big-endian and little-endian.
From: hongyi.zhao@gmail.com (hongy...@gmail.com)
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 by: hongy...@gmail.com - Tue, 22 Aug 2023 13:58 UTC

See my following example:

werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=big
1234 5678
werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=little
3412 7856

Could you tell me why the latter doesn't give the following result?

7856 3412,
aka,
0x78 0x56 0x34 0x12

Regards,
Zhao

Re: About the big-endian and little-endian.

<uc2ht1$2erik$1@dont-email.me>

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From: janis_papanagnou+ng@hotmail.com (Janis Papanagnou)
Newsgroups: comp.unix.shell
Subject: Re: About the big-endian and little-endian.
Date: Tue, 22 Aug 2023 16:49:05 +0200
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 by: Janis Papanagnou - Tue, 22 Aug 2023 14:49 UTC

On 22.08.2023 15:58, hongy...@gmail.com wrote:
> See my following example:
>
> werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=big
> 1234 5678
> werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=little
> 3412 7856

(My 'od' doesn't support '--endian'; I use different options below
and show only the little-endian results.)

>
> Could you tell me why the latter doesn't give the following result?

Endian-ness swaps bytes in "words" (default "word" is 2 octets; you
define what a "word" is).

$ echo -n -e $'\x12\x34\x56\x78' | od -An -t x1
12 34 56 78
$ echo -n -e $'\x12\x34\x56\x78' | od -An -t x2
3412 7856
$ echo -n -e $'\x12\x34\x56\x78' | od -An -t x4
78563412
$ echo -n -e $'\x12\x34\x56\x78\x90\xab' | od -An -t x8
0000ab9078563412

Janis

>
> 7856 3412,
> aka,
> 0x78 0x56 0x34 0x12
>
> Regards,
> Zhao
>

Re: About the big-endian and little-endian.

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Subject: Re: About the big-endian and little-endian.
From: hongyi.zhao@gmail.com (hongy...@gmail.com)
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 by: hongy...@gmail.com - Wed, 23 Aug 2023 00:47 UTC

On Tuesday, August 22, 2023 at 10:49:11 PM UTC+8, Janis Papanagnou wrote:
> On 22.08.2023 15:58, hongy...@gmail.com wrote:
> > See my following example:
> >
> > werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=big
> > 1234 5678
> > werner@X10DAi:~$ echo -n -e "\x12\x34\x56\x78" | od -An -x --endian=little
> > 3412 7856
> (My 'od' doesn't support '--endian'; I use different options below
> and show only the little-endian results.)

What's your version of 'od'? Mine is as follows:

werner@X10DAi:~$ od --version|head -1
od (GNU coreutils) 8.32

> >
> > Could you tell me why the latter doesn't give the following result?
> Endian-ness swaps bytes in "words" (default "word" is 2 octets; you
> define what a "word" is).
>
> $ echo -n -e $'\x12\x34\x56\x78' | od -An -t x1
> 12 34 56 78
> $ echo -n -e $'\x12\x34\x56\x78' | od -An -t x2
> 3412 7856
> $ echo -n -e $'\x12\x34\x56\x78' | od -An -t x4
> 78563412
> $ echo -n -e $'\x12\x34\x56\x78\x90\xab' | od -An -t x8
> 0000ab9078563412

Got it. Thank you very much for your explanation.
>
> Janis

Zhao

> >
> > 7856 3412,
> > aka,
> > 0x78 0x56 0x34 0x12
> >
> > Regards,
> > Zhao
> >

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