<*.txt> is the equivalent of glob('*.txt'), which is a function that returns a list of files. In addition, you are iterating over the list of files in DIR with your readdir loop. You should only use one of these two methods. glob is a bit easier to use than readdir, although you should use File::Glob ':bsd_glob'; to prevent issues with whitespace in the argument, and also keep in mind that glob does not list filenames beginning with a dot by default.

use warnings;
use strict;
use File::Glob ':bsd_glob';

my $DIR = "C:/Users/tyang/Documents/Traning";
my @files = glob("$DIR/*.txt");
for my $file (@files) {
    next unless -f $file;
    print $file, ' ';
    my $age = -M $file;
    if ($age > 7) {
        print "the age is ",int($age)," old than a week";
    }
    print "\n";
}

[download]

Update: Added the -f check.

In reply to Re: print out certain extension files by haukex
in thread print out certain extension files by ytjPerl

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