free
:'
total used free shared buffers cached
Mem: 513712 503976 9736 0 5312 122916
-/+ buffers/cache: 375748 137964
Swap: 1052248 104712 947536
'
:'
usage: free [-b|-k|-m|-g] [-l] [-o] [-t] [-s delay] [-c count] [-V]
-b,-k,-m,-g show output in bytes, KB, MB, or GB
-l show detailed low and high memory statistics
-o use old format (no -/+buffers/cache line)
-t display total for RAM + swap
-s update every [delay] seconds
-c update [count] times
-V display version information and exit
'
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