Ok, you don't often need to build your own control flow constructs, but it was exactly that capability that allowed the very successful Expect utility to be bui

Ok, you don't often need to build your own control flow constructs, but it was exactly that capability that allowed the very successful Expect utility to be built on top of Tcl - https://en.wikipedia.org/wiki/Expect https://en.wikipedia.org/wiki/Expect .