How to prepend to a file (add at the top)

Question

Imagine you have a file

sink(\"example.txt\")
data.frame(a = runif(10), b = runif(10), c = runif(10))
sink()

and would want to add some hea

Answer 1

In any language there is ultimately only one solution. And that is to overwrite the whole file:

contents = readAllOf("example.txt")

overwrite("example.txt", header + contents )