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Top Forums Shell Programming and Scripting sort, columns, no result! can I print files of "planes"? Post 302564585 by mirni on Friday 14th of October 2011 06:26:31 AM
Old 10-14-2011
Using awk is probably the easiest way. It handles floating point arithmetics well (whereas bash doesn't):

Code:
$ cat input
-0.012    0.0060    0.0    0.13972813076023477    
-0.012    0.0064319163    4.2894483E-4    0.1959584596359705    
-0.011398672    0.00644576    0.0    0.20924591828425124    
-0.012    0.0068638325    8.5788965E-4    0.19486370704346412
-0.9	  0.5555	  1.0024	  944
0.9	  33		  100.7E-2     blah	
someValue 2ndCol	  -20.098e-1	  YES!
$ for z in -2 -1 0 1 2 ; do 
> echo "================ z=$z ==========" 
> awk -v"z=$z" '$3>z-0.05 && $3<z+0.05' input 
> done
================ z=-2 ==========
someValue 2ndCol	  -20.098e-1	  YES!
================ z=-1 ==========
================ z=0 ==========
-0.012    0.0060    0.0    0.13972813076023477    
-0.012    0.0064319163    4.2894483E-4    0.1959584596359705    
-0.011398672    0.00644576    0.0    0.20924591828425124    
-0.012    0.0068638325    8.5788965E-4    0.19486370704346412
================ z=1 ==========
-0.9	  0.5555	  1.0024	  944
0.9	  33		  100.7E-2	  blah
================ z=2 ==========

I use awk's -v switch to set the variable "z", and then outer shell loop to loop through it. Although you could as well (actually more efficiently) do the outer z loop within awk itself. The awk command is just the condition; which results in printing the line that fullfills the condition.
You can then easily redirect the output to a file, and sort the output files, if you like.
I have a feeling you can figure out the rest yourself, but if you need help, feel free to ask.

Last edited by mirni; 10-14-2011 at 07:35 AM..
 

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