My fault. You need to add the path to the filename when testing with -M like this

my @files = grep {!/\_NSA|d+_\d+\.xml/ && (-M "$path/$_") > $min_age} readdir DIR;

I only tested in the current directory where it does not make any difference.

In reply to Re^5: list files based on age and pattern by hdb
in thread list files based on age and pattern by kaka_2

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