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Top Forums Shell Programming and Scripting Extract duplicate fields in rows Post 302147704 by anhtt on Wednesday 28th of November 2007 05:07:44 AM
Old 11-28-2007
Extract duplicate fields in rows

I have a input file with formating:

6000000901 ;36200103 ;h3a01f496 ;
2000123605 ;36218982 ;heefa1328 ;
2000273132 ;36246985 ;h08c5cb71 ;
2000041207 ;36246985 ;heef75497 ;

Each fields is seperated by semi-comma. Sometime, the second files is duplicated. So I'd like to extract all the lines which have duplicated second field to a new file. Example for output file:

2000273132 ;36246985 ;h08c5cb71 ;
2000041207 ;36246985 ;heef75497 ;

How to do this with awk or shell script ?
Other programming, I don't know.
 

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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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