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  1. or download this
    use File::Find;           
my $size = 0;             
find(sub { $size += -s if -f $_ }, "foo");
  2. or download this
    use File::Find;           
my $size = 0;             
find(sub { $size += -s if $File::Find::name eq "foo/$_" and -f $_}, "f
+oo");