nixCraft

UNIX command to check free and used memory. Can anyone show me command for this task?

TIA

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$ vmstat
System configuration: lcpu=2 mem=8192MB
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
2 3 2336209 49400 0 11 8 227 157 0 234 8614 830 28 7 60 5
$ vmstat 5 5
System configuration: lcpu=2 mem=8192MB
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
2 0 2337381 48080 0 0 0 0 0 0 581 4301 1294 60 4 36 0
1 0 2336206 49193 0 1 0 0 0 0 650 3980 1417 57 5 36 1
3 0 2342415 42938 0 3 0 0 0 0 653 8710 1541 66 9 23 1
4 0 2359028 26293 0 3 0 0 0 0 678 41228 2382 61 19 19 1
9 1 2382768 2515 0 3 0 0 0 0 1213 69808 2459 65 33 1 0

try using this commands

#free
or
#free -m
total used free shared buffers cached
Mem: 248 227 21 0 78 110
-/+ buffers/cache: 38 209
Swap: 572 0 572

or the best

#top

or

#vmstat