Hi I have 25 files containing two columns in each file. I want to find and print common (ID and name for example ID121 ABC14) data present in in each of 25 files 

File 1
ID121 ABC14
ID122 EFG87
ID145 XYZ43
ID157 TSR11
ID181 ABC31
ID962 YTS27
ID567 POH70
ID921 BAMD80

File 2
ID111 RET61
ID157 TSR11
ID181 ABC31
ID962 YTS27
ID452 FYU098
ID121 ABC14
ID122 EFG87

File 3
ID121 ABC14
ID612 FLOW12
ID122 EFG87
ID745 KIDP36
ID145 XYZ43
ID157 TSR11

.........

File 25

ID122 EFG87
ID809 EYE24
ID157 TSR11
ID921 BAMD80
ID389 TOP30
ID121 ABC14


Output:

ID121 ABC14
ID122 EFG87
ID157 TSR11

[download]

All these files are .txt files so i want to compare all 25 files and print data that exists in all 25 files. Please help. 

#!/usr/bin/perl

use strict;
use warnings;
my %result;

my @counts=();

foreach (@ARGV) {
  my $column=0;

open my A, "<", "@counts "could not open file1 $!";
while (<A>) {
    chomp;
    my $key = (split /\t/, $_)[0];
    $result{$key} = 1;
    $result{$key}++;

    if ($result{$key} == 20 { 
        print "Line with $key is present in all twenty \n";
    }
}    
close (A);
};

foreach (@counts) {
   s/^\s//g; 
 print $_,"\n";
};

[download]

In reply to find common data in multiple files by mao9856

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