Use sort to sort numerical column

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ppmhist

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)

Shell Programming and Scripting