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Top Forums Shell Programming and Scripting Remove non printing characters from file Post 302976363 by jgt on Tuesday 28th of June 2016 04:17:29 PM
Old 06-28-2016
Remove non printing characters from file

How do I remove the printer escape sequence, the first 5 characters, that occurs on every 33rd line in a file, see hex dump of line 1.
Code:
0000    1e 00 00 00 00 0a 0a 0a  20 0a 20 20 20 20 20 20   ....
0010    20 20 20 20 20 20 20 20  20 20 0a 42 49 4c 4c 20

Thanks,
 

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XD(1)							      General Commands Manual							     XD(1)

NAME
xd - hex, octal, decimal, or ASCII dump SYNOPSIS
xd [ option ... ] [ -format ... ] [ file ... ] DESCRIPTION
Xd concatenates and dumps the files (standard input by default) in one or more formats. Groups of 16 bytes are printed in each of the named formats, one format per line. Each line of output is prefixed by its address (byte offset) in the input file. The first line of output for each group is zero-padded; subsequent are blank-padded. Formats other than -c are specified by pairs of characters telling size and style, by default. The sizes are 1 or b 1-byte units. 2 or w 2-byte big-endian units. 4 or l 4-byte big-endian units. 8 or v 8-byte big-endian units. The styles are o Octal. x Hexadecimal. d Decimal. Other options are -c Format as 1x but print ASCII representations or C escape sequences where possible. -astyle Print file addresses in the given style (and size 4). -u (Unbuffered) Flush the output buffer after each 16-byte sequence. -s Reverse (swab) the order of bytes in each group of 4 before printing. -r Print repeating groups of identical 16-byte sequences as the first group followed by an asterisk. SOURCE
/sys/src/cmd/xd.c SEE ALSO
db(1) BUGS
The various output formats don't line up properly in the output of xd. XD(1)
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