If I understand what you mean, something like this might work: 

#! /usr/bin/perl
use strict;
use warnings;
my $path = "./IN/";
my $string = 'ABC';
my @filesWithString;

opendir (my $directory, $path) or die $!;
while(readdir $directory) 
    {
        next if $_ =~ m/^\./;
        my $fileName = "$path" . "$_";
        open (my $checkForString, "<", "$fileName");
        while (<$checkForString>)
            {
                print STDERR "$_";
                if ($_ =~ m/$string/)
                    {
                        push (@filesWithString, $fileName);
                    }
            }
        close $checkForString;
     }
closedir $directory;

for (@filesWithString)
    {
        my $newName = "$_".'.ABC.txt';
        open (my $old, "<", $_);
        open (my $new, ">", $newName);
        while (<$old>)
            {
                print $new "$_";
            }
        close $old;
        close $new;
    }

[download]

Although there's probably a simpler way of doing it.

In reply to Re: Rename the text file WRT String by mtmcc
in thread Rename the text file WRT String by reddevil420

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