Stop an R program without error

Question

Is there any way to stop an R program without error?

For example I have a big source, defining several functions and after it there are some calls to the functions.

Answer 1

In addition to answer from Stibu on Mar 22 '17 at 7:29, if you want to write a message as a part of stop(), this message is not written.

I perceive strange that following two lines have to be used meaning on.exit(options(options(show....))) doesn't work.

opt <- options(show.error.messages = F)
on.exit(options(opt))

Answer 2

You're looking for the function browser.

Answer 3

why not just use an if () {} else {}? It's only a couple of characters...

f1 <- function(){}
f2 <- function(){}

if (justUpdate) {
} else {
# main body 
}

or even

f1 <- function(){}
f2 <- function(){}

if (!justUpdate) {
# main body 
}