Working out used physical memory in solaris 10

    pcanham@solman:~$ echo "`prtconf | grep 'Memory size' | awk '{print $3}'` - (`vmstat 1 2 | tail -1 | awk '{print $5}'` /1024)" | bc
    4891

    pcanham@solman:~$ prtconf | grep 'Memory size' | awk '{print $3}'
    8064

    pcanham@solman:~$ echo "4891/(8064/100)" | bc
    61