in the grep, you have a regex, with a rather strange looking pattern. 
my @files = grep {/_*_.txt/}  readdir DIR;

[download]
perhaps: 
my @files = grep {/\.txt$/}  readdir DIR;

[download]
is all that you need? The $ anchors the regex to the end of the string. An underscore "_" would be unusual before a .txt ending. Without escaping the "." like "\.", the dot means any character, which doesn't look like that you want.

When debugging, print @files to make sure that you are getting the files that you want.

In reply to Re: read the whole folder files by Marshall
in thread read the whole folder files by perllearner007

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