Newbie questions

• database refinement - minimal cover of F (extraneous attributes)
• Why is a process's address space divided into four segments (text, data, stack and heap)?
• How can I know which shell I am using?
• How can I add shadow to a circle UIImageView or UIView?
• What exactly does delegate do in xcode ios project?
• how to convert a string to a Unix timestamp in javascript?
• How to reinstall rpm package?
• Is it possible to hide/encode/encrypt php source code and let others have the system?

Newbie answers