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Top Forums UNIX for Beginners Questions & Answers Help with pattern match and Extract Post 303025945 by Don Cragun on Thursday 15th of November 2018 01:32:13 PM
Old 11-15-2018
Quote:
Originally Posted by arunkumar_mca
I should have said that "_SB" or "_B".

... ... ...
Is this supposed to help us figure out what you're trying to do?

Why should you have said anything about "_SB" or about "_B"? Neither of those strings appears anywhere in any line of your sample input!

If you're unwilling to answer our questions and are unwilling to give us a clear specification of what you are trying to do, there is very little that we can do to help you. Smilie
 

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ppmtopgm(1)                                                   General Commands Manual                                                  ppmtopgm(1)

NAME
ppmtopgm - convert a portable pixmap into a portable graymap SYNOPSIS
ppmtopgm [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces a portable graymap as output. The output is a "black and white" rendering of the original image, as in a black and white photograph. The quantization formula used is .299 r + .587 g + .114 b. Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically. pgmtoppm is for colorizing a pgm file. Also, see ppmtorgb3 for a different way of converting color to gray. And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate the original colors, not necessarily a way that looks like a black and white photograph. QUOTE
Cold-hearted orb that rules the night Removes the colors from our sight Red is gray, and yellow white But we decide which is right And which is a quantization error. SEE ALSO
pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5) AUTHOR
Copyright (C) 1989 by Jef Poskanzer. 10 April 2000 ppmtopgm(1)
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