Server Statistics

Can you give me scripts on how to get the following info?

capacity metrics
-server hd capacity
-db total size / db free-space
-server hd size versus db size
-db growth rate
-db file location
-db transaction

performance metrics
-sql server cpu utilization
-sql server memory utilization
-sql server network utilization
-sql server user connections
-db log growth
-db txns/sec
-db %log use

---- Thanks in advance ------