How to make a hexdump line by line with xxd?

Question

To create sample file with cat.

cat > /tmp/test.txt <<EOF
> X1
> X22
> X333
> X4444
> EOF

To check the content in sample file.

cat  /tmp/test.txt
X1
X22
X333
X4444

To make a hexdump with xxd.

xxd   /tmp/test.txt
0000000: 5831 0a58 3232 0a58 3333 330a 5834 3434  X1.X22.X333.X444
0000010: 340a

How to make a hexdump line by line with xxd in such way as below:

58 31 0a
58 32 32 0a
58 33 33 33 0a
58 34 34 34 34 0a

score 3 · Answer 1 · answered Feb 18 '17 at 12:23

3

$ xxd  -ps </tmp/test.txt|sed -e 's/\(..\)/\1 /g' -e 's/0a /0a\n/g'
58 31 0a
58 32 32 0a
58 33 33 33 0a
58 34 34 34 34 0a

answered Feb 18 '17 at 12:23

Ipor Sircer

Plus one for being the first who came up with this kind of solution! The accept-vote should be yours! – hek2mgl Feb 18 '17 at 13:01
I have tested with other long files, no enough robustness for long files. – showkey Feb 18 '17 at 13:05
how long is *long*? I mean size in bytes, number of lines? – hek2mgl Feb 18 '17 at 13:07
Please download it and save as /home/urls.csv , to test it with **xxd -ps – showkey Feb 18 '17 at 13:10
I see, thanks for the test file. Now it is clear! Yeah, the answer is wrong in that case because `xxd -ps` wraps lines at 60 chars. – hek2mgl Feb 18 '17 at 13:13

hek2mgl · Accepted Answer · 2017-02-18T12:54:49.070

2

After all I found the hexdump tool in combination with sed the best solution:

hexdump -v -e '/1 "%02x "' /tmp/test.txt | sed 's/0a /0a\n/g'

edited Feb 18 '17 at 12:54

answered Feb 18 '17 at 12:21

hek2mgl

It is **xargs -I'{}' bash -c 'xxd <<< "${1}"' -- '{}' < /tmp/test.txt**,not **xargs -I'{}' bash -c 'xxd <<< "${1}" -- '{}' < /tmp/test.txt** – showkey Feb 18 '17 at 12:50
what do you mean? – hek2mgl Feb 18 '17 at 12:52
In your second answer, there is a **'** lost,it is **"${1}"'** ,not **"${1}"** . – showkey Feb 18 '17 at 13:02
Ah I see! :D Damn, that was hard to get. :) ... Anyhow, looks like the xargs approach wasn't a good idea at all. – hek2mgl Feb 18 '17 at 13:04

showkey · Answer 3 · 2017-02-18T13:56:12.823

Please download it and save as /home/urls.csv.

To test with
hexdump -v -e '/1 "%02x "' /home/urls.csv | sed 's/0a /0a\n/g'

To test with
xargs -I'{}' bash -c 'xxd <<< "${1}"' -- '{}' < /home/urls.csv

To test with
xargs -I'{}' bash -c 'hd <<< "${1}"' -- '{}' < /home/urls.csv

To test with

xxd  -ps </home/urls.csv |sed -e 's/\(..\)/\1 /g' -e 's/0a /0a\n/g'

It is clear that Ipor Sircer's answer is no enough robustness for long files.

3 Answers3