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Full Discussion: Remove duplicates separated by delimiter
Top Forums Shell Programming and Scripting Remove duplicates separated by delimiter Post 303017775 by Don Cragun on Tuesday 22nd of May 2018 06:07:14 AM
Old 05-22-2018
Hi enrikS,
If keeping the input order of elements in fields 6 and 7 is important and you want <tab> as your output field separator (as shown in your second code snippet), you could also try:
Code:
awk '
BEGIN {	OFS = "\t"
}
function RMDUP(input,	i, n, NoDupArray, output, ValueArray) {
	n = split(input, ValueArray, /,/)
	NoDupArray[output = ValueArray[1]]
	for(i = 2; i <= n; i++)
		if(!(ValueArray[i] in NoDupArray)) {
			output = output "," ValueArray[i]
			NoDupArray[ValueArray[i]]
		}
	return output
}
{	$6 = RMDUP($6)
	$7 = RMDUP($7)
}
1' data

In addition to the change you have already made to your original post, note also that if you want the field 6 output to be:
Code:
A1-A2,A5-A6,A1-A4

you can't have the input be:
Code:
A1-A2,A5-A6,A1-A2,A1-4

The above code produces the output:
Code:
M3	C2	V5	D5	HH:FF	A1-A2,A5-A6,A1-4	B4-B6,B2-B4,B1-B2

from the sample input you provided in post #1.

For some hints as to why your second code snippet didn't work, note that your awk code is specifying that the input field separator (FS) is a <tab> character, but there are no <tab>s in your sample input (just <space>s; no <tab>s). Therefore, your awk script is only seeing one input field; not eight. And split()ing an empty field (e.g., $6) produces an array with zero elements.
 

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LEARN ABOUT V7

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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