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Full Discussion: Replacing digits using sed
Top Forums UNIX for Dummies Questions & Answers Replacing digits using sed Post 302903830 by Aia on Thursday 29th of May 2014 10:56:06 PM
Old 05-29-2014
Quote:
Originally Posted by Don Cragun
This will work with some versions of sed, but it isn't portable.

The following should work with any version of sed:
Code:
sed -e 's/^a[0-9][0-9]*/aw/'

Little clue gave it away
Quote:
sed -i 's/^aa*[0-9]/aw/g' file_name.

Last edited by Aia; 05-30-2014 at 12:07 AM.. Reason: Irrelevant
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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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