free—displays amount of free and used memory in the system

free [-b | -k | -m] [-o] [-s delay ] [-t] [-V]

free displays the total amount of free and used physical and swap memory in the system, as well as the shared memory and buffers used by the kernel.

Example A.30.

% free

           total       used       free     shared   buffers  cached

Mem:       64148      54528       9620      45632   3460     29056

-/+ buffers/cache:    22012      42136

Swap:      96352          0      96352