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Top Forums UNIX for Dummies Questions & Answers Grep certain lines with condition Post 302803897 by RudiC on Tuesday 7th of May 2013 04:04:32 PM
Old 05-07-2013
Don Cragun's 4. item could be hexadecimal as well...
Yes the spec needs to be refined!
Assuming lexicographic/string sort, and avoiding the loss of order occurring when using for (i in Arr) - well, had the input file had any order, that is - , this might satisfy your request:
Code:
$ sort file | awk -F, 'NR>1 && TMP1 != $1 {print TMP0} {TMP0=$0; TMP1=$1} END {print TMP0}'
aaaa,52C
bbbb,58C
cccc,60C

 

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ppmhist(1)						      General Commands Manual							ppmhist(1)

NAME
ppmhist - print a histogram of a portable pixmap SYNOPSIS
ppmhist [-hexcolor] [-noheader] [-map] [-nomap] [-sort={frequency,rgb}] [ppmfile] DESCRIPTION
Reads a PPM image as input. Generates a histogram of the colors in the image, i.e. a list of all the colors and how many pixels of each color are in the image. OPTIONS
-sort={frequency,rgb} The -sort option determines the order in which the colors are listed in the output. frequency means to list them in order of how pixels in the input image have the color, with the most represented colors first. rgb means to sort them first by the intensity of the red component of the color, the of the green, then of the blue, with the least intense first. The default is frequency. -hexcolor Print the color components in hexadecimal. Default is decimal. -noheader Do not print the column headings. -map Generates a PPM file of the colormap for the image, with the color histogram as comments. -nomap Generates the histogram for human reading. This is the default. SEE ALSO
ppm(5), pgmhist(1), ppmtomap(1), pnmhistmap(1), ppmchange(1) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 17 September 2000 ppmhist(1)
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