Load
          all platforms  :  load

       CPU Usage
          Linux  : user | nice | system | idle
          *BSD   : user | nice | system | interrupt | idle
          IRIX   : user | system | interrupt | wait | idle
          HPUX   : user | nice | system | interrupt | idle

       Memory Usage
          Linux  : used | shared | buffers | free
          NetBSD : active | inactive | wired | free
          FreeBSD: active | inactive | wired | buffer | free
          OpenBSD: active | inactive | wired | free
          IRIX   : kernel | fs   | user    | free
          HPUX   : text | used   | other   | free

       Swap Usage
          all platforms except IRIX: used | free

       Disk Usage (bytes/sec)
          Linux  : in  |  out  | idle
          *BSD   : transferred | idle

       Page Swapping from/to disk
          all platforms except IRIX  : in | out | idle

       NET Usage
           bytes/sec
           Linux  : in | out | idle
           *BSD   : in | out | idle
           HPUX   : < Not Supported >

       GFX Usage
           swapbuffers/sec
           IRIX   : number of swapbuffers

       Interrupts
           "leds" which blink when an interrupt occurs.
           Linux  : IRQs 0 - 15
           *BSD   : IRQs 0 - 15 (or fewer, depending on architecture)
           HPUX   : < Not Supported >

       Interrupt rate
           interrupts per second
           Linux  : < Not Supported >
           *BSD   : interrupts | free
           HPUX   : < Not Supported >

       Serial Port Status
           "leds" which show the serial port parameters.
           Linux  : Both the Line Status Register
                    (LSR) and Modem Status Register
                    (MSR) are displayed.
           *BSD   : < Not Supported >
           HPUX   : < Not Supported >

       Battery Level
           Shows the current condition of the
           battery (for laptops).
           Linux  : %left | %used
           NetBSD : %left | %used
           FreeBSD: < Not Supported >
           OpenBSD: %left | %used
           HPUX   : < Not Supported >

       RAID status
           Shows the state of disks contained in your (software)
           RAID1/4/5 array(s) and the rebuild state of the
           array(s).
           Linux  : Disk0 Disk1 Disk2 .. DiskN | Rebuild Progress