xubuntu@xubuntu:~$ free -m
             total       used       free     shared    buffers     cached
Mem:          7950       4379       3571          0       2935        822
-/+ buffers/cache:        621       7329
Swap:            0          0          0
xubuntu@xubuntu:~$ free -m
             total       used       free     shared    buffers     cached
Mem:          7950       4455       3495          0       3009        822
-/+ buffers/cache:        623       7327
Swap:            0          0          0
xubuntu@xubuntu:~$ free -m
             total       used       free     shared    buffers     cached
Mem:          7950       4644       3306          0       3192        822
-/+ buffers/cache:        628       7322
Swap:            0          0          0
xubuntu@xubuntu:~$