How do I stop a program from running in terminal?

Use Ctrl + Break key combo.

How do you end a program in Unix?

if you do ctrl-z and then type exit it will close background applications. Ctrl+Q is another good way to kill the application. If you don’t have control of your shell, simply hitting ctrl + C should stop the process. If that doesn’t work, you can try ctrl + Z and using the jobs and kill -9 %<job #> to kill it.