in reply to How to execute the perl program on different files in the same directory

You could make yourself an array of files to work over using readdir and grep: 
opendir DIR, "Dir_With_Files" or die "Cannot open diretory: $!";
my @files = grep { /\.txt$/ } readdir DIR;
closedir DIR;

foreach my $file (@files) {
   do stuff;
}

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