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Top Forums Shell Programming and Scripting Running script in crontab in a specific directory Post 302933576 by bakunin on Friday 30th of January 2015 07:10:37 PM
Old 01-30-2015
Quote:
Originally Posted by Don Cragun
Actually, the POSIX Standards have required conforming shells to support export commands with the SYNOPSIS forms [...] since 1992.
Oops. ~blushes~

Quote:
Originally Posted by Don Cragun
But, of course, if you're working on a project that is still using a pure Bourne shell
I have to admit that i do not (any more). I just learned that once and never bothered to change my habits. Thanks for the correction.

bakunin
 

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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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