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Re: Linux Bug to command ( OD ) - Written by Jim Meyering
From: |
Eric Blake |
Subject: |
Re: Linux Bug to command ( OD ) - Written by Jim Meyering |
Date: |
Fri, 17 Jul 2009 19:10:13 -0600 |
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Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.22) Gecko/20090605 Thunderbird/2.0.0.22 Mnenhy/0.7.6.666 |
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According to trever plantaginate on 7/17/2009 4:22 PM:
> OD is listing the bytes of a file in reverse order due to how it would look
> in memory and not how the bytes appear in the file.
Not true, nor is this a bug in od. There is a difference between
little-endian and big-endian machines, and od is one of the tool that
exposes those differences (you will get your desired ordering if you were
to repeat your same test on a different architecture). You are seeing the
listing exactly as it would appear reading 16 bits at a time given your
machine's endianness.
If you truly want byte listings, rather than uint16_t listings, then use
od -tx1.
> Pipes to and from this command would alter the original oder of the
file's contents.
Pipes effectively pass 8 bits at a time, not 16 bits at a time. So, on
your machine (regardless of whether it is little- or big-endian), data
will not be scrambled. You only get scrambling when you interpret
multiple bytes as a single entity in a different manner than which your
hardware does.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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