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Top Forums Shell Programming and Scripting Remove duplicate columns in input file Post 302498844 by alister on Tuesday 22nd of February 2011 03:21:50 PM
Old 02-22-2011
Code:
awk '{s=$1+0>$3?$1$3:$3$1} s in a {next} !a[s]' file

A more readable, maintainable, ungolfed version:
Code:
awk '
{
    s = (($1+0 > $3) ? $1$3 : $3$1)
    if (s in a)
        next
    a[s] = 1
    print
}
' file

Regards,
Alister
 

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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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