Java tutorial
import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.nio.file.StandardOpenOption; public class Test { public static void main(String[] args) throws IOException { Path file = Paths.get("/home/docs/users.txt"); Path newFile = Paths.get("/home/docs/newUsers.txt"); try (InputStream in = Files.newInputStream(file); OutputStream out = Files.newOutputStream(newFile, StandardOpenOption.CREATE, StandardOpenOption.APPEND)) { int data = in.read(); while (data != -1) { out.write(data); data = in.read(); } } } }