Display amount of free and used memory on the illumos

Usage: free [-p]
Display the amount of free and used system memory

Example

# free
           total       used       free     locked     kernel     cached
Mem:       36.0G      5.47G      1.14G      3.10G      4.56G      21.7G
Swap:      30.5G      19.0G      11.5G