[user02@FC4 Lesson04]$ cat -n twolines.c

   1  #include <stdio.h>
   2
   3  int main(void)
   4  {
   5     printf("This is line one\nThis is line two\n");
   6
   7     return 0;
   8  }

[user02@FC4 Lesson04]$ gcc -o twolines twolines.c
[user02@FC4 Lesson04]$ ./twolines
This is line one
This is line two