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Full Discussion: Need help to use regex to do search and replace. Don't know how to and can't figure out how :(
Top Forums UNIX for Beginners Questions & Answers Need help to use regex to do search and replace. Don't know how to and can't figure out how :( Post 303026960 by RudiC on Wednesday 5th of December 2018 04:38:12 PM
Old 12-05-2018
Quote:
Originally Posted by newbie_01
Hi RudiC

Doesn't work on Solaris but works perfectly on Linux.
Where and how does it fail? Please give as detailed and complete an error message as possible.

Quote:
01 - Why are you escaping the # in the beginning?
man sed:
Quote:
Addresses.
.
.
\cregexpc
Match lines matching the regular expression regexp. The c may be any character.
I use the # here because the usual / is part of the pattern.


Quote:
02 - The p before the (_ is because I want to match a single p? Is that correct?
Yes.


Quote:
03 - The #s//\1t\2/ is the one that I don't understand for the most part. Is it doing another search?
The # is the final address delimiter. An empty regex (s//) repeats the last one encountered, here: the address regex.
 

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LEARN ABOUT OSX

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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