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Full Discussion: Search and replace specific positions of specific lines
Top Forums Shell Programming and Scripting Search and replace specific positions of specific lines Post 302994925 by Scrutinizer on Wednesday 29th of March 2017 01:13:20 PM
Old 03-29-2017
Quote:
Originally Posted by dsid
if i understand correctly, you are searching for lines starting with 4000, go on with any characters till the 136th position; the next 3 dots (...) should be replaced with a 036;\1 ->would be the 1st instance of the search yielding a positive result.
[..]
That is correct, a dot in regex means "any character" .



--
Quote:
Originally Posted by RudiC
[..]
In Scrutinizer's proposal there's no check the three to-be-replaced characters really are "000" as specified in post#1.
Hi RudiC, IMO that was not a specification, but rather a remark. It says: which will be '000', therefore I used '...' instead..
This User Gave Thanks to Scrutinizer For This Post:
dsid
 

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LEARN ABOUT SUNOS

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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