How to get the amount of free physical memory?

How to get the amount of free physical memory?
(without sudo or root)

vmstat will give it to you.
Although the question depends a bit on what you mean by free memory.
The figure vmstat labels free (in any reasonably recent version of solaris) actually represents memory mostly filled with cached file contents. So it represents memory that can be easily released if needed by something more important.
Like most unix versions, solaris will use any free memory to cache files thats have been read/written previously just in case they are needed again

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