Sum in Script

From: kristianto.setiawan@sun.co.id
Date: Fri Sep 17 2004 - 18:38:02 EDT


Hi script expert :
I have a data like this :
# cat /data/vxdg-g_free=sapdg1.out
DISK DEVICE TAG OFFSET LENGTH FLAGS
sapdg101 c2t0d0s2 c2t0d0 165 10011 -
sapdg101 c2t0d0s2 c2t0d0 16787392 3008 -
sapdg101 c2t0d0s2 c2t0d0 50344832 6016 -
sapdg101 c2t0d0s2 c2t0d0 58739456 6592 -
sapdg101 c2t0d0s2 c2t0d0 58746147 10077 -
sapdg101 c2t0d0s2 c2t0d0 67144832 6592 -
sapdg101 c2t0d0s2 c2t0d0 67151523 10077 -
sapdg101 c2t0d0s2 c2t0d0 143328768 192 -
sapdg102 c2t1d0s2 c2t1d0 16777216 3008 -
sapdg102 c2t1d0s2 c2t1d0 50334656 6016 -
sapdg102 c2t1d0s2 c2t1d0 50340969 9879 -
sapdg102 c2t1d0s2 c2t1d0 58739456 6592 -
sapdg102 c2t1d0s2 c2t1d0 67134656 6592 -
sapdg102 c2t1d0s2 c2t1d0 143308416 192 -
sapdg102 c2t1d0s2 c2t1d0 143309235 19725 -

How to create the shell script to sum only the length column (5th) to get total free space disk from that data above ?

Rgds,
Kristianto
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