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Top Forums Shell Programming and Scripting Delete repeated rows from a file Post 302137257 by ghostdog74 on Monday 24th of September 2007 04:05:03 AM
Old 09-24-2007
GNU awk:
Code:
awk '{  a[$1]=$0 } 
        END{
                n = asort(a)
                for (i=1;i<=n;i++) print a[i] 
        }
' "file"

Quote:
Originally Posted by pbsrinivas
cat Input_file|sort -ruk 1n
no need for cat

Quote:
Originally Posted by jaduks
Code:
cat file | awk '{print $1}' | sort | uniq | while read firstf; do awk '$1=="'"$firstf"'"' file | sed '1!d' ; done

there's no need to go to such extent.
 

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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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