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Full Discussion: How to reform text string?
Top Forums Shell Programming and Scripting How to reform text string? Post 302948218 by Don Cragun on Saturday 27th of June 2015 12:00:51 AM
Old 06-27-2015
Quote:
Originally Posted by pilnet101
Looking at coming up with another solution for this in pure shell, similar to Don's solutions - I have been trying to use parameter expansion/substitution. I can only envisage that this would be achievable by doing this only if back references are supported. Looking at several sources online - ksh93 supposedly supports them, can anyone confirm this?

Something along the lines of:
Code:
tmp=${HOST_LIST// / strings=}
echo ${tmp//strings=\([![:digit:]]\)/\1"\n"}

With the above code, bash version:
Code:
GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin14)

and ksh version:
Code:
Copyright (C) 2007 Free Software Foundation, Inc.
  version         sh (AT&T Research) 93u+ 2012-08-01

produce the output:
Code:
t70c7n133 strings=16 strings=t70c7n134 strings=16 strings=t70c7n135 strings=16 strings=t70c7n136 strings=16 strings=t70c7n137 strings=16 strings=t70c7n138 strings=16 strings=t70c7n140 strings=16 strings=t70c7n141 strings=16

This User Gave Thanks to Don Cragun For This Post:
pilnet101
 

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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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