The following is a demonstration of the swapinfo.d script,

   # ./swapinfo.d
   RAM  _______Total   511 MB
   RAM      Unusable     8 MB
   RAM        Kernel   128 MB
   RAM        Locked     0 MB
   RAM          Used   256 MB
   RAM          Free   118 MB
   
   Disk _______Total  1023 MB
   Disk         Resv   626 MB
   Disk        Avail   397 MB
   
   Swap _______Total  1335 MB
   Swap         Resv   626 MB
   Swap        Avail   709 MB
   Swap    (Minfree)    62 MB

The output above gives a summary of the state of virtual memory (swap)
on the system.