What is the difference between spawn and exec?

Question

I\'m learning to write a TCL (expect) scripts and I notice that some examples show to use spawn, while others show the command exec. I tried googling, but can\'t find what is th

Answer 1

As far as I know, spawn returns a process ID (and links in with Expect), while exec just returns the final stdout, unless you pass "&". So it won't affect your expects.