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Top Forums Shell Programming and Scripting building output file from multiple input files Post 302340589 by Franklin52 on Tuesday 4th of August 2009 03:32:04 AM
Old 08-04-2009
It's complicated to do this in one awk command with many arrays, it's more clarifying to split this in more steps:

Code:
awk 'NR==FNR{a[$1];next}
$1 in a
' fileA fileB > temp

awk 'NR==FNR{a[$2]=$0;next}
$1 in a {print a[$1], $2}
' temp fileC > temp1

awk 'NR==FNR{a[$3]=$0;next}
$1 in a {print a[$1], $2}
' temp1 fileD

rm temp temp1

 

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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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