"But what does 'return 0' do?" "It returns the value zero to the calling process." "Calling what?" "The process. Usually it will be the shell." "Wait, you just

"But what does 'return 0' do?" "It returns the value zero to the calling process." "Calling what?" "The process. Usually it will be the shell." "Wait, you just said process, what is this 'shell'?"