12-03-2012
Quote:
Originally Posted by
vgersh99
a* - zero or more occurrences of a
Hi Vgresh, My output doesn't contain any occurrence of "a"
---------- Post updated at 11:52 PM ---------- Previous update was at 11:46 PM ----------
Thanks in2nix4life,
Quote:
It's capturing the 'c'. If you change the 'c' to a 'z', then nothing will be returned since there is neither an 'a' or 'z' in the string.
Yes i do understand that its capturing the 'c', but my problem is to understand the functionality of '*'. How does it work, and what does it really look for in a string??
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LEARN ABOUT MINIX
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)