07-09-2007
Quote:
Is there any work around ?
Use temporarary files instead of pipes.
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howdy all,
i've been trying to find info on piping info between multiple commands from the command line, but i've been unable to find any examples of piping continuous data through a chain of commands. basically, i'm trying to parse data from the top command and send it out over udp to another... (1 Reply)
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Now before this thread gets closed, please be aware this is not classwork or homework, I am trying to learn unix by myself, and have come stuck below. So it is a pointless to close this thread, as I am trying to improve my unix by asking advice from people. That is what I assume a forum is for!
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How would I combine commands in a pipeline to produce an alphabetized list of who's online at a particular moment?
Then:
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LEARN ABOUT XFREE86
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)