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Top Forums UNIX for Beginners Questions & Answers Using sed to split hex string Post 303037222 by sand1234 on Friday 26th of July 2019 09:13:41 AM
Old 07-26-2019
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

 

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UNIUNMASK(1)						      General Commands Manual						      UNIUNMASK(1)

NAME
uniunmask - XOR bits or substitute glyphs in a GNU Unifont file. SYNOPSIS
uniunmask [-iinput_file] [-ooutput_file] DESCRIPTION
uniunmask reads a GNU Unifont .hex file. As it reads the font file, it scans for code points matching entries in the "masks.hex" and "sub- stitutes.hex" files. "masks.hex" and "substitutes.hex" are also in GNU Unifont .hex format, ordered by Unicode code point (the hexadecimal number to the left of the colon on each line). If a code point is encountered from "substitutes.hex", the input code point in the original .hex file is ignored (as is any entry with the same code point in "masks.hex") and the glyph from "substitutes.hex" is written to the output file. Otherwise, if a code point is encountered from "masks.hex", the input glyph in the original .hex file is XORed with the bits in the "masks.hex" entry. The result of this XOR operation is written to the output file. OPTIONS
-i Specify the input file. The default is stdin. -o Specify the output file. The default is stdout. FILES
masks.hex, substitutes.hex, *.hex GNU Unifont font files SEE ALSO
bdfimplode(1), hex2bdf(1), hex2bdf-split(1), hex2sfd(1), hexbraille(1), hexdraw(1), hexmerge(1), johab2ucs2(1), unibmp2hex(1), unicover- age(1), unidup(1), unihex2bmp(1), unipagecount(1) AUTHOR
uniunmask was written by Paul Hardy. LICENSE
uniunmask is Copyright (C) 2007 Paul Hardy, and is released under version 2 of the GNU General Public License, or (at your option) a later version. BUGS
No known real bugs exist, except that this software does not perform extensive error checking on its input files. If they're not in the format of the original GNU Unifont hex file, all bets are off. 2008 Jul 6 UNIUNMASK(1)
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