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Full Discussion: String search - Command to find second occurance
Top Forums UNIX for Dummies Questions & Answers String search - Command to find second occurance Post 302149587 by jim mcnamara on Thursday 6th of December 2007 03:59:57 PM
Old 12-06-2007
Other than looping or using awk, perl, or python, I have no other idea except an extreme hack like this:

Code:
#!/bin/ksh

# total line in file
wc -l inputfile | read filelen dummy

# find the line to start reading on
grep -n 'some string' inputfile | head -n 2 | tail -n 1 | read startline dummy

# subtract start line from total 
length=$(( $filelen - $startline ))

# tail the lines you need.
tail -n $length inputfile

If you are running this against a large file it will waste considerable resources.
It wastes resources anyway, because it reads thru the file several times.
 

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LEARN ABOUT DEBIAN

tca_correct

TCA_CORRECT(1)							       HUGIN							    TCA_CORRECT(1)

NAME

       tca_correct - Calculate transverse chromatic aberration

SYNOPSIS

       tca_correct [options] inputfile

       <inputfile> is the base name of 4 image files:

       <inputfile>
	   Colour file to compute TCA parameters

       red_<inputfile>
	   Red channel of <inputfile>

       green_<inputfile>
	   Green channel of <inputfile>

       blue_<inputfile>
	   Blue channel of <inputfile>

       The channel images must be colour images with 3 identical channels.  If any of -R, -G, or -B is given, this file name is used instead of
       the derived name.

       Output: commandline arguments for fulla

DESCRIPTION

       Generates fulla command-line parameters for correction of transverse chromatic aberration (TCA) from sample photos. Ideal sample photos
       would have a lot of contrast over the entire image area, little saturated colour and no blown highlights.

OPTIONS

       -h  Display help

       -l  input file is PTO file instead of image

       -m method
	   optimization method (0 normal, 1 newfit)

       -o optvars
	   string of variables to optimize ("abcvde")

       -r  Reset values (this will zero a,b,c,d,e params and set v to 10) makes sense only with -l option

       -s <scale>
	   Scale for corner detection

       -n <number>
	   number of points per grid cell (default: 10)

       -g <number>
	   divide image in <number>x<number> grid cells (default: 10)

       -t num
	   Remove all control points with an error higher than num pixels (default: 1.5)

       -v  Verbose

       -w filename
	   write PTO file

       -R <r>
	   Use this file as red channel

       -G <g>
	   Use this file as green channel

       -B <b>
	   Use this file as blue channel

AUTHORS

       Written by Pablo d'Angelo and others.

"Version: 2011.4.0"						    2011-12-02							    TCA_CORRECT(1)
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