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Top Forums Shell Programming and Scripting Filtering out duplicates with the highest version number Post 302723263 by Chubler_XL on Monday 29th of October 2012 07:16:52 PM
Old 10-29-2012
Another awk solution:

Code:
awk -F_ '$2>0+V[$1]{V[$1]=$2;F[$1]=$0} END{for(k in V) print F[k]}' OFS=_ infile

This should work for quite large files, however the output will be unsorted, you didn't specify if the file order was important.
 

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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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