Hardware/System
FREE

FREE - Display Amount of Free and Used Memory in the System

free -t (-t for Total line) displays the following:
totalusedfreesharedbufferscached
Mem:6304481925485240486125400
-/+ buffers/cache:218060864
swap:000
Total:6304410372115716

All values are in KBytes

free with no options displays as above only without the Total line
free -o displays as above only without the Total Line and the -/+ buffers/cache lines
free -b displays as above only with values in bytes












see ps - report process status
see ps - display top CPU processes