Shell Programming and Scripting

I need to check ram size and currently free in sun solaris box

Total ram: prtconf | grep Memory
For current free, it would be best to use top. Or else, you can use vmstat.

> prtconf | grep Memory
Memory size: 8192 Megabytes

The above is 8mb ???

> vmstat
procs memory page disk faults cpu
r b w swap free re mf pi po fr de sr m0 m1 m5 m6 in sy cs us sy id
0 0 0 6346568 2718288 0 0 0 0 0 0 0 11 0 2 2 4294967196 0 0 -17 -10 -1
34

could u tell me total physical memory and free memory now

8gb you mean ...

Physical memory is 8mb is ok

Now tell me free memory

generally vmstat gives the statistics of the virtual or swapped memory memory, here this statistics may changes based on the process handling, so
prtconf | grep Memory is the only instance of getting the physical memory info

for getting the available free memory using free only we can get

How do I know the free memory for creating another oracle instance