How to jailbreak 7.1.2 iOS (iPhone 4) without installing any programs?

How do I jailbreak 7.1.2 iOS (iPhone 4) without installing any programs?

You'll have to write your own program then.

You can install the program in the computer and then delete it after its done. If you are talking about programs in your phone, then Cydia will always be on it, so one way or another, there will always be a program involved.

You just need to run the pangu executable file. No install needed.