How to print only the hex values from hexdump without the line numbers or the ASCII table?

Question

following Convert decimal to hexadecimal in UNIX shell script

I am trying to print only the hex values from hexdump, i.e. don't print the lines numbers and the ASCII table.

But the following command line doesn't print anything:

hexdump -n 50 -Cs 10 file.bin |  awk '{for(i=NF-17; i>2; --i) print $i}'

age is not the primary factor, but rather upvotes and answer quality ;-) http://meta.stackoverflow.com/questions/251938/should-i-flag-a-question-as-duplicate-if-it-has-received-better-answers — Ciro Santilli OurBigBook.com, Sep 04 '15 at 08:34
hexdump file.bin | sed "s/[^ ]* //1" This will remove the line numbers, by default the ascii table wouldn't be printed. — Owl, Jul 18 '17 at 09:19

0x90 · Answer 1 · 2022-02-03T12:32:35.820

84

Using xxd is better for this job:

xxd -p -l 50 -seek 10 file.bin

From man xxd:

xxd - make a hexdump or do the reverse.

    -p | -ps | -postscript | -plain
        output in postscript continuous hexdump style. Also known as plain hexdump style.

    -l len | -len len
        stop after writing <len> octets.
 
    -seek offset
        When used after -r: revert with <offset> added to file positions found in hexdump.

edited Feb 03 '22 at 12:32

answered Mar 21 '13 at 17:53

0x90

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@andsens `hexdump` is in busybox, and thus available on embedded, whilst `xxd` isn't :Ь – Hi-Angel Jul 24 '15 at 12:13

chepner · Accepted Answer · 2013-03-25T12:59:13.057

66

You can specify the exact format that you want hexdump to use for output, but it's a bit tricky. Here's the default output, minus the file offsets:

hexdump -e '16/1 "%02x " "\n"' file.bin

(To me, it looks like this would produce an extra trailing space at the end of each line, but for some reason it doesn't.)

edited Mar 25 '13 at 12:59

answered Mar 21 '13 at 17:54

chepner

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Great!! Usefull for me this answer! But I think is better also to have `-C` option. And if you add `cut -c 9- | head -n 1` your output will display only the hex numbers. – Kyrol Apr 21 '15 at 13:58
[This blog entry](https://blog.senpaisilver.com/linux/formatting-hexdumps-output/) shows more examples how to modify the output format of `hexdump`. – Matthias Braun Jan 09 '21 at 12:56
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Add `-v` to list every line and not to compress same lines with `*` – dagelf Nov 03 '21 at 09:03

score 30 · Answer 3 · answered Mar 21 '13 at 17:15

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As an alternative, consider using xxd -p file.bin.

answered Mar 21 '13 at 17:15

twalberg

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score 4 · Answer 4 · answered Mar 21 '13 at 17:06

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First of all, remove -C which is emitting the ascii information.

Then you could drop the offset with

hexdump -n 50 -s 10 file.bin | cut -c 9-

answered Mar 21 '13 at 17:06

glenn jackman

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it seems to work but changes the endian... – 0x90 Mar 21 '13 at 17:10

How to print only the hex values from hexdump without the line numbers or the ASCII table?

4 Answers4

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