Using command line how to open a specific section of GUI System Preferences?
You have to know where the actual PreferencePane resides. Just supply the full path to the section you want.

For Apple supplied PreferencePanes it's easy:

open /System/Library/PreferencePanes/Security.prefPane


opens your desired System Preferences > Security and Privacy. 

Other preferencePanes might be found at /Library/PreferencePanes or ~/Library/PreferencePanes