CopyDirectory recursively copies a directory.

ReadFile reads the file from path, if not found, it will print the absolute path, instead of relative path.

TerminateOnFullDisk panics if the input error is (or wraps) the system "out of disk space" error.

WriteFile writes a byte array to the file at the given path.

WriteJSON marshals the given interface into JSON and writes it to the given path.

WriteText writes a byte array to the file at the given path.