The memory status of the system can be checked using using the free command or by viewing /proc/meminfo to see how much real memory is being used for caches and buffers. The free command displays the output as:-
total used free shared buff/cache available Mem: 8025280 2398372 2601912 427948 3024996 4932656 Swap: 2097148 0 2097148
Here total is the total memory available, while used, free, shared, buff/cache are memory used, free memory and shared memory, buff/cache memory respectively, whereas available is the memory available to use.
