title: subsititue of getchar and clrscr() in c for linux
body: <p>I am working on Ubuntu these days. When I compiled my C program using gcc, it is giving the error <code>conio.h</code> doesn't exists. 
  I want to use <code>clrscr()</code> and <code>getch()</code> function.
  Can you please tell me the substitute of this header file in linux.</p>