The code should select list.txt from first directory and then process all the 10 list.txt files one by one from each of the 10 directories.
chdir "my_parent_dir";
my @files = glob("*/list.txt");
for my $item(@files){
open my $currentfile, '<', $item;
.. do something...
close $currentfile;
} # and go to the next item of the loop
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