Scripts see Memory Static every 5 seconds

[oracle@ptud1 PT8.54]$ more tho.sh
while true
do
free
echo "-----VTG-----------" $(date) "-----------------"
sleep 5
done
[oracle@ptud1 PT8.54]$ sh tho.sh
             total       used       free     shared    buffers     cached
Mem:       8062556    7894200     168356          0     104628    3922636
-/+ buffers/cache:    3866936    4195620
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:48 ICT 2015 -----------------
             total       used       free     shared    buffers     cached
Mem:       8062556    7894588     167968          0     104636    3922636
-/+ buffers/cache:    3867316    4195240
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:53 ICT 2015 -----------------
             total       used       free     shared    buffers     cached
Mem:       8062556    7894960     167596          0     104640    3922636
-/+ buffers/cache:    3867684    4194872
Swap:      8191992      48316    8143676
-----VTG----------- Tue Jul 14 16:58:58 ICT 2015 -----------------

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