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Top Forums Shell Programming and Scripting Computing the ratio of similar columns in the two files using awk script Post 302598245 by Chubler_XL on Monday 13th of February 2012 11:20:23 PM
Old 02-14-2012
There is no purpose of assigning a[$2]=1 as any reference to a[$2] will create the array entry. The following will work just as well (only difference is that the array will contain blank entries for each element):

Code:
awk 'NR==FNR{a[$2];next}$2 in a{print $2}' t1 t2

The following will display count of number of matches between two files:

Code:
awk 'NR==FNR{a[$2];next}$2 in a{b[$2]}END{print length(b)}' t1 t2

Only populates b[] if $2 from t2 was inserted into a[] during processing of file t1.
Length of b is total number of elements in b[] (i.e. count of matches).
This User Gave Thanks to Chubler_XL For This Post:
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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