How to get the actual memory utilization?

Hi,

I would like to know is there any command or tricks to get the actual memory utilization without confuse with buffer and cache utilization? I wanted to know the actual utilization and free space of my memory.

As for now, I'm using "free -m" command, but I need to minus the buffer and cache to get the actual utilization. It there any ways to get the information?

I got this understanding from this link :

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Tuning_and_Optimizing_Red_Hat_Enterprise_Linux_for_Oracle_9i_and_10g_Databases/chap-Oracle_9i_and_10g_Tuning_Guide-Memory_Usage_and_Page_Cache.html

Thank you very much for your kindness!