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Full Discussion: AWK Compare previous value with current.
Top Forums Shell Programming and Scripting AWK Compare previous value with current. Post 302509451 by rdcwayx on Wednesday 30th of March 2011 09:33:05 PM
Old 03-30-2011
Init the input file:

Code:
$ cat infile
1,mnq,1
1,ddd,2
1,ddd,3
1,sss,4
1,ddd,5
1,add,6
1,fff,7
1,ddr,8
1,rrd,9
1,der,10
2,mnq,11
3,pqr,12
4,pqr,13
5,pqr,14
12,adhe,0
13,add,1

Get the output:
Code:
$ awk -F , '{if (!a[$2]) {a[$2]=$3} else {$3=a[$2]}}1' OFS="," infile
1,mnq,1
1,ddd,2
1,ddd,2
1,sss,4
1,ddd,2
1,add,6
1,fff,7
1,ddr,8
1,rrd,9
1,der,10
2,mnq,1
3,pqr,12
4,pqr,12
5,pqr,12
12,adhe,0
13,add,6

For your second request, I guess you need export to different files depend on the number on column 3.

Code:
awk -F , '{if (!a[$2]) {a[$2]=$3} else {$3=a[$2]}}1' OFS="," infile |awk -F , '{print >$3 ".txt"}'

after that, you will get file 1.txt, 12.txt, etc.
This User Gave Thanks to rdcwayx For This Post:
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LEARN ABOUT DEBIAN

graphics::primitive::insets

Graphics::Primitive::Insets(3pm)			User Contributed Perl Documentation			  Graphics::Primitive::Insets(3pm)

NAME

       Graphics::Primitive::Insets - Space between things

DESCRIPTION

       Graphics::Primitive::Insets represents the amount of space that surrounds something.  This object can be used to represent either padding
       or margins (in the CSS sense, one being inside the bounding box, the other being outside)

SYNOPSIS

	 use Graphics::Primitive::Insets;

	 my $insets = Graphics::Primitive::Insets->new({
	   top	   => 5,
	   bottom  => 5,
	   left    => 5,
	   right   => 5
	 });

METHODS

   Constructor
       new Creates a new Graphics::Primitive::Insets.

   Instance Methods
       as_array
	   Return these insets as an array in the form of top, right, bottom and left.

       bottom
	   Set/Get the inset from the bottom.

       equal_to
	   Determine if these Insets are equal to another.

       left
	   Set/Get the inset from the left.

       right
	   Set/Get the inset from the right.

       top Set/Get the inset from the top.

       zero
	   Sets all the insets (top, left, bottom, right) to 0.

AUTHOR

       Cory Watson, "<gphat@cpan.org>"

SEE ALSO

       perl(1)

COPYRIGHT &; LICENSE
       Copyright 2008-2010 by Cory G Watson.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.12.3							    2010-08-21					  Graphics::Primitive::Insets(3pm)
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