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Full Discussion: comparing two fields from two different files in AWK
Top Forums Programming comparing two fields from two different files in AWK Post 302580132 by tukuyomi on Wednesday 7th of December 2011 03:21:28 PM
Old 12-07-2011
Quote:
Originally Posted by Cybex2011
1. how file_2's lines being stored into f2?

Use the 1st line of file_2 as an example, "fcust_034_60 2"
==> f2[$1]=$2
In this example:f2['cust_034_60']=2
f2 is the array, and yes, 'cust_034_60' is an array index Smilie
(not sure where you got fcust_034_60 however...)

Quote:
Originally Posted by Cybex2011
2. how f2's element being retrieved by the code
==> f2[$2]?

If it had just put a field in the 1st step,
how could the code use "fcust_034_60" now read in from file_1 to search against the array f2?
See my previous statement Smilie
This User Gave Thanks to tukuyomi For This Post:
Cybex2011
 

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LEARN ABOUT DEBIAN

ppmtopgm

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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