I'll explain the map section for you.
my @files = grep { !/.+$/ && -M $_ > 1; } map { $mydir."/".$_; } readdir(DIR);
is basicly the same as
# get the base file names
my @files = readdir(DIR);
# for each $file in @files, append the path to the front
@files = map { $mydir."/".$_; } @files;
# for each $file in @files, if it doesn't match the criteria then remo
+ve it from @files
@files = grep { !/.+$/ && -M $_ > 1; } @files;
I hope that I didn't confuse you even more (:
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