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Top Forums Shell Programming and Scripting Variable not passed to the sed command Post 302937590 by Scrutinizer on Friday 6th of March 2015 10:51:19 AM
Old 03-06-2015
Quote:
Originally Posted by emily
My code setup seem to be reaching it completeness to perform the desired task..thanks a lot everyone for great help Smilie Smilie
I always find useful and timely help here..

Dear Scrutinizer,
I just have a small question, which is "why the new value could not be assigned to the Index inside ?"

thank you,
Emily
You're welcome...

From man bash:
Quote:
Here Documents
This type of redirection instructs the shell to read input from the current source until a line containing only word (with no trailing blanks) is seen. All of the lines read up to that point are then used as the standard input for a command.
So everything inside the here document is standard input to the cat command (not commands that are executed)

Since EOF is unquoted:
Quote:
If word is unquoted, all lines of the here-document are subjected to parameter
expansion, command substitution, and arithmetic expansion...
This User Gave Thanks to Scrutinizer For This Post:
 

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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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