10-08-2010
Quote:
From what I understand now, is :
Your script does a cd
No, that's exactly what it can't do since the directory specified might not exist.
Quote:
the 2 first examples will work not the next ones, why?
None of the examples work atm since I'm not sure how to do this. I probably could make them all work by making loads of if arguments and substr's. That feels more like a workaround to me though, and I'm looking for a direct way to do this.
Quote:
(clue: Commonly in unix, not giving the path is uderstood as *relative" to current, as you can see why your two last examples will not work.
Actually the first example was using a relative path as well.
Quote:
You would now have to write a few tests in your script to see if argument could be a directory in a tree using the command find and hope it is unique if not... I let you choose the way you want to end...
Like I said, the directory might not exist and the point is to grab directory names from the syntax argument so I wouldn't know what to search for.
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LEARN ABOUT FREEBSD
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)