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Full Discussion: update a file by key
Top Forums Shell Programming and Scripting update a file by key Post 302112379 by matrixmadhan on Tuesday 27th of March 2007 11:17:00 PM
Old 03-28-2007
Quote:
Originally Posted by ynixon
It is even working faster Smilie
Code:
#! /opt/third-party/bin/perl

open(FILE, "<", "m") || die "Unable to open file <$!>\n";

while(<FILE>) {
  chomp;
  @arr = split(/;/);
  $j = "$arr[0];$arr[1]";
  $fileHash{$j} = $arr[2];
}

close(FILE);

open(FILE, "<", "n") || die "Unable to open file <$!>\n";

while(<FILE>) {
  chomp;
  @arr = split(/;/);
  $j = "$arr[0];$arr[1]";
  if( exists $fileHash{$j} ) {
    $fileHash{$j} = $arr[2];
  }
  else {
    $fileHash{$j} = $arr[2];
  }
}

close(FILE);

foreach my $key ( keys %fileHash ) {
  print "$key;$fileHash{$key}\n";
}

exit 0

this should be even more faster Smilie
 

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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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