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Top Forums UNIX for Dummies Questions & Answers finding overlapping names in different txt files Post 302688129 by agama on Friday 17th of August 2012 09:15:51 PM
Old 08-17-2012
If your files are relatively small a simple awk should work:

Code:
awk '
    { c[$1]++; f[$1] = f[$1] FILENAME " "; }
    END {
        for( x in f )
            if( c[x] > 1 )
                printf( "%s %s\n", x, f[x] );
    }
'  file-1 file-2 file-3...

If your files are large, such that keeping the entire list in memory might not be possible/practical, this should work:

Code:
awk '{ print FILENAME, $0 }'  file1 file2 file3  | sort -k 2,2 | awk '
    p != $2 {
        if( n > 1 )
            printf( "%s %s\n", p, f );
        n = 1;
        f = $1 " ";
        p = $2
        next;
    }
    {
        n++;
        f = f $1 " ";
    }'

More effort, but doesn't require everything to be kept in memory by awk.
This User Gave Thanks to agama For This Post:
 

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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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