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Top Forums UNIX for Beginners Questions & Answers Reading file and matching it from set of file Post 303004511 by Don Cragun on Tuesday 3rd of October 2017 01:04:09 PM
Old 10-03-2017
Quote:
Originally Posted by RudiC
Shouldn't that be substr($0,1,8) in A?
Yes. But on most versions of awk that I have used, both produce the same results.

Quote:
I wasn't sure if the substring to be compared had to be in chars 1 - 8 or start in 1 - 8 , i.e. possibly be from 8 - 15
Me either. That is why telling us what operating system and shell are being used and sample input and desired output are so important.
 

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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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