Performance issue with 'grep' command for huge file size Post: 302574925

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111111111100000000001111111111 123232323200000010001114545454 232435424200000000001232131212 342354234301000000002323423443 232435424200000000001232131212 2390898994200000000001238908092 This is the record format. From 11th position to 20th position in a record there are 0's occuring,and...

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What is the faster way to grep from huge file?

Hi All, I am new to this forum and this is my first post. My requirement is like to optimize the time taken to grep the file with 40000 lines. There are two files FILEA(40000 lines) FILEB(40000 lines). The requirement is like this, both the file will be in the format below...

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LEARN ABOUT OSF1

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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