Find Heap, Stack and swap memory of a process

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Linux

shellscript

Hello everybody,

This may be the known question but before asking this I had searched a lot but did not find the precise answer.

1.) How to find out the Heap, Stack and Swap memory usage of current running process in Linux box?
2.) How to find out total and dynamic Heap and Stack allocated in the entire Linux box?

I know to find out the Heap memory usage of current running process as below
$ awk '{print $23}' /proc/{process_id}/stat
But this is achieved by opening a file rather I wanted to find this out with the direct command.

Also, I hope this question arises in many others mind and would be very helpful for the answer.
Many thanks.