Using sed to split hex string


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# 1  
Using sed to split hex string

Hi,

I'm looking to split the following hex string into rows of four elements.

I've tried the following but it doesn't seem to work. How can I tell sed to match based on a pair of number(s) and letter(s), and add a newline every 4 pairs?
In addition, I need to add another newline after every string has been processed.

Code:
echo "1C 50 A9 D3 8B B0 24 9C 14 1C 50 A9 D3 8B B0 24" | sed -nr 's/[0-9A-Z]{2}/\n/4p'
1C 50 A9
 8B B0 24 9C 14 1C 50 A9 D3 8B B0 24 9C 14

Expected output:

Code:
1C 50 A9 D3
8B B0 24 9C

14 1C 50 A9
D3 8B B0 24

# 2  
Code:
 | sed 's/\(\([0-9A-F][0-9A-F] \)\{4\}\)/\1\n/g'

# 3  
Insert a \n every 12 characters:
Code:
sed -nr 's/.{12}/&\n/gp'

If you really want to indentify 4 elements:
Code:
sed -nr 's/([0-9A-F]{2} ){4}/&\n/gp'

With BRE (no -r) it is like the previous solution:
Code:
sed -n 's/\([0-9A-F][0-9A-F] \)\{4\}/&\n/gp'

This User Gave Thanks to MadeInGermany For This Post:
# 4  
regex / wctype offer a "character class" for hex:

Code:
sed -nr 's/([[:xdigit:]]{2} ){4}/&\n/gp'

This User Gave Thanks to RudiC For This Post:
# 5  
Hi.
Code:
echo "1C 50 A9 D3 8B B0 24 9C 14 1C 50 A9 D3 8B B0 24" |
fold -12 |
sed '2~2a\
'

producing:
Code:
1C 50 A9 D3 
8B B0 24 9C 

14 1C 50 A9 
D3 8B B0 24

Where the GNU extension '2~2' starts with line 2, then after each 2nd line adds a newline.

On a system like:
Code:
OS, ker|rel, machine: Linux, 3.16.0-7-amd64, x86_64
Distribution        : Debian 8.11 (jessie) 
bash GNU bash 4.3.30
fold (GNU coreutils) 8.23
sed (GNU sed) 4.2.2

Best wishes ... cheers, drl

Last edited by drl; 07-27-2019 at 10:25 AM..
# 6  
You might try as well
Code:
echo "1C 50 A9 D3 8B B0 24 9C 14 1C 50 A9 D3 8B B0 24" | tr ' ' $'\n' | paste -sd'   \n'

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