Hi BR

Thank you for your time and patience. As you suggested i tried to match two files (4_os_10.txt and 4_os_11.txt) and I got desired output that is common data with your code and also with the code provided by BillKSmith. I tried it for more that 3 files .txt pair and found that maybe there isn't anything common among all 25 files.

I found that matched data exist only in 18 files out of 25 when i used following code. Please correct me if i get it wrong. It prints matched first column with common ID (say ID121) among all 25 files and then print second name only if it exists in file. Thus output I get files column all IDs and second column of each of 25 .txt files. 

#!/usr/bin/env perl
use strict;
use warnings;
my %data;

while (<>) {
    my ( $key, $value ) = split;
    push( @{ $data{$key} }, $value );
}

foreach my $key ( sort keys %data ) {
    if ( @{ $data{$key} } >= @ARGV ) {
        print join( "\t", $key, @{ $data{$key} } ), "\n";
    }
}

$ code.pl *.txt

[download]

Please suggest me if this code can give me desired output. Regards mao9856

In reply to Re^8: find common data in multiple files by mao9856
in thread find common data in multiple files by mao9856

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