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Full Discussion: Read n lines from a text files getting n from within the text file
Top Forums Shell Programming and Scripting Read n lines from a text files getting n from within the text file Post 302852993 by Don Cragun on Thursday 12th of September 2013 11:56:43 PM
Old 09-13-2013
Quote:
Originally Posted by Chubler_XL
Good points Don Cragun, my assumption was that the value in the data line was less than then number of lines and any additional lines need to be discarded.

In my solution, any processing could be done in the NR <=R block:

Code:
awk -F: '/#data/ { R=NR+$2} NR<=R { "Any processing code here"; print }' infile

Understood.

The O.P. said the output "can be directed to a gnuplot ot (sic) output to a file.", but didn't specify any options for gnuplot and didn't specify filenames nor whether the headers should be included in the files or stripped from the files. There is no gnuplot man page in the Man Pages section of this forum, but some references I found said that it is very picky about having its input in tab separated fields (and the data lines given in the sample input have no tabs). Should all data be sent to one instantiation of gnuplot or should the data under each header be sent to a different instantiation of gnuplot?

I don't think I can do much more until we get a clarification on the requirements.
 

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LEARN ABOUT DEBIAN

empty-page

EMPTY-PAGE(1)							 ExactImage Manual						     EMPTY-PAGE(1)

NAME

       empty-page - empty page detector of the ExactImage toolkit

SYNOPSIS

       empty-page [option...] {-i | --input} input-file

       empty-page {-h | --help}

DESCRIPTION

       ExactImage is a fast C++ image processing library. Unlike many other library frameworks it allows operation in several color spaces and bit
       depths natively, resulting in low memory and computational requirements.

       empty-page counts dark pixels of a black and white image and decides with a threshold whether the page is most probably empty, and thus can
       be removed from the image processing stream.

OPTIONS

       -i file, --input file
	   Read image from the specified file.

       -m n, --margin n
	   Set width of border margin to skip. For speed reasons, the margin has to be a multiple of 8. The default is 16.

       -p x, --percentage x
	   Set fraction of permissible dark pixels. The default is 0.05 (5%).

       -h, --help
	   Display help text and exit.

EXAMPLES

	   $ empty-page -i test.tif
	   The image has 75461 dark pixels from a total of 1060992 (7.11231%).
	   non-empty

EXIT STATUS

       The exit status is 0 if the image is mostly white, 1 otherwise.

SEE ALSO

       exactimage(7)

AUTHORS

       Jakub Wilk <jwilk@debian.org>
	   Wrote this manual page for the Debian system.

       http://www.exactcode.de/site/open_source/exactimage/
	   This manual page incorporates texts found on the ExactImage homepage.

COPYRIGHT

       This manual page was written for the Debian system (and may be used by others).

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 or (at
       your option) any later version published by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.

empty-page							    09/09/2013							     EMPTY-PAGE(1)
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