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# Sorts files in $dir and sets $latest->{file} with newest file.
my $latest = (sort {$b->{mtime} <=> $a->{mtime}}
...
map {{mtime => -M $_, file => $_}}
<$dir/*>)[-1];
my $oldM = (stat $oldest->{file})[9];

# Sorts files in $dir and sets $latest->{file} with newest file and se
+ts $oldest->{file} with oldest file.
my ( $latest, $oldest ) = (
...
    )[ 0, -1 ];

my ( $newM, $oldM ) = map +( stat )[ 9 ], $latest->{ file }, $oldest->
+{ file };

# Opens $dir and counts number of files
opendir(DIR, $dir);
...
$fCountL++;
}
closedir(DIRL);

# Opens $dir and counts number of files
opendir my $DIR, $dir or die "Cannot opendir '$dir' because: $!";
...
opendir my $DIRL, $dirL or die "Cannot opendir '$dirL' because: $!";
my $fCountL = grep "$dirL/$_" !~ /\A\.\.?\z/, readdir $DIRL;
closedir $DIRL;