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my @a = (
  [4129290, 1675967, 2412031, '41%', '/usr/bin' ],
...
======
before sort: /local
Sorted by drive: /usr/bin

my @df_k = split(/\n/, `df -k`);

...
   [    \@sorted_by_drive   ],
   [qw(  $sorted_by_drive  )],
));

sub parseIntoArraySolaris (@df)
                            ^^ what does this mean?
...
                               but it's not listed in
                               docs and it doesn't give
                               the args to the var @df.

sub parseIntoArraySolaris {
   my @rows;
...

   return @rows;
}

sub parseIntoArraySolaris {
   return map {
...
      [ $b/1024, $c/1024, $d/1024, $e, $f ]
   } @_;
}

my @df_k = split(/\n/, `df -k`);

...
   [    \@sorted_by_drive   ],
   [qw(  $sorted_by_drive  )],
));

# Get data.
my @df_k = split(/\n/, `df -k`);
...
   [    \@sorted_by_drive   ],
   [qw(  $sorted_by_drive  )],
));