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Full Discussion: compare 2 files based on columns
Top Forums Shell Programming and Scripting compare 2 files based on columns Post 302489414 by Scrutinizer on Thursday 20th of January 2011 11:29:01 AM
Old 01-20-2011
1. Yes, the code needs to be expanded a little...
Code:
 awk 'NR==FNR{A[$1,$2]=$0;next}
        {if(A[$1,$2])
             {print $0,A[$1,$2];delete A[$1,$2]}
          else print>ARGV[2]".nomatch"
        }
        END{for(i in A)if(A[i])print A[i]>ARGV[1]".nomatch"}' f2 f1

2. Here is an explanation:
'NR==FNRFor every line do, if we are reading the first file ( that is when FNR and NR are the same) then
A[$1,$2]=$0create an array element with name of field 1 and field 2 ($1,$2) in array A that contains the line ($0)
next} read the next line of the first file and don't do further processing on this line
A[$1,$2]If we are reading the second file then for every line... if Array element with $1 and $2 of the second file exists then
print $0,A[$1,$2]print the current line and A[$1,$2]
f2 f1first read f2, then f1
 

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LEARN ABOUT OSX

io::lines

IO::Lines(3)						User Contributed Perl Documentation					      IO::Lines(3)

NAME

       IO::Lines - IO:: interface for reading/writing an array of lines

SYNOPSIS

	   use IO::Lines;

	   ### See IO::ScalarArray for details

DESCRIPTION

       This class implements objects which behave just like FileHandle (or IO::Handle) objects, except that you may use them to write to (or read
       from) an array of lines.  They can be tiehandle'd as well.

       This is a subclass of IO::ScalarArray in which the underlying array has its data stored in a line-oriented-format: that is, every element
       ends in a "
", with the possible exception of the final element.  This makes "getline()" much more efficient; if you plan to do line-
       oriented reading/printing, you want this class.

       The "print()" method will enforce this rule, so you can print arbitrary data to the line-array: it will break the data at newlines
       appropriately.

       See IO::ScalarArray for full usage and warnings.

VERSION

       $Id: Lines.pm,v 1.3 2005/02/10 21:21:53 dfs Exp $

AUTHORS

   Primary Maintainer
       David F. Skoll (dfs@roaringpenguin.com).

   Principal author
       Eryq (eryq@zeegee.com).	President, ZeeGee Software Inc (http://www.zeegee.com).

   Other contributors
       Thanks to the following individuals for their invaluable contributions (if I've forgotten or misspelled your name, please email me!):

       Morris M. Siegel, for his $/ patch and the new "getlines()".

       Doug Wilson, for the IO::Handle inheritance and automatic tie-ing.

perl v5.16.2							    2005-02-10							      IO::Lines(3)
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