new file mode 100644
--- /dev/null
+++ b/file_demo.c
@@ -0,0 +1,45 @@
+/**
+ *     $Id: file_demo.c,v 1.1.1.1 2008-04-28 17:32:53 mbroeker Exp $
+ * $Source: /development/c/demos/file_demo.c,v $
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <string.h>
+#include <fcntl.h>
+
+int main (int argc, char **argv)
+{
+    int fd1;
+    int fd2;
+    int mode;
+    char *str = "Schreib mal was!";
+
+    if (argc != 2)
+        return -1;
+    mode = strtoul (argv[1], NULL, 8);
+
+    system ("/bin/rm -f /home/mbroeker/Desktop/test1.txt");
+    system ("/bin/rm -f /home/mbroeker/Desktop/test2.txt");
+
+    /*
+     * Opens ReadOnly
+     */
+    fd1 = open ("/home/mbroeker/Desktop/test1.txt", O_CREAT, mode);
+    fd2 = open ("/home/mbroeker/Desktop/test2.txt", O_RDWR | O_CREAT, mode);
+
+    if (fd1)
+        if (write (fd1, str, strlen (str)) == -1)
+            perror ("FD1");
+
+    if (fd2)
+        if (write (fd2, str, strlen (str) + 1) == -1)
+            perror ("FD2");
+
+    close (fd1);
+    close (fd2);
+    return 0;
+}