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Full Discussion: append field to file(nawk)
Top Forums Shell Programming and Scripting append field to file(nawk) Post 57939 by Ygor on Wednesday 10th of November 2004 10:46:57 AM
Old 11-10-2004
If the match is on the 3rd field of the 2nd file, then you can try this awk...
Code:
BEGIN {
   FS=","
   while(getline<xref) arr[$1]=$2
   FS=" "
}
$3 in arr {
   print $0, arr[$3] 
}

Use it like this...

awk -f above.awk -v xref=file_a file_b

Tested on the sample data...

Date Name 352020252365988 Reference 652020100572356
Date2 Name2 546876543215667 Reference 652065465654686
 

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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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