Free space in Veritas's diskgroup

1. for free in `vxdg -g <VXDG> free | awk '{print $5}' | grep -v LEN`; do mbs=`echo "($free*512)/1024/1024" | bc`; echo "In megabytes = $mbs"; done
then sum all Megs
echo "($1+$2....+$n)/1024" | bc
2. free=`vxassist -g <VXDG> maxgrow <VOL1> | awk '{print $7}'`; echo "$free/(1024*1024*2)" | bc