kotlin-stdlib / kotlin.io.path / java.nio.file.Path / relativeTo relativeTo JVM JRE7 1.4 @ExperimentalPathApi fun Path.relativeTo(base: Path): Path Calculates the relative path for this path from a base path. Note that the base path is treated as a directory. If this path matches the base path, then a Path with an empty path will be returned. Exceptions IllegalArgumentException - if this and base paths have different roots. Return the relative path from base to this.