title: what if _POSIX_VDISABLE value is -1?
body: <p>In POSIX _POSIX_VDISABLE value if -1, there is no disabling character for special character for all the terminal device files; otherwise the value is the disabling character value..</p>
  
  <p>Can please anyone help me understand this. I m not able to get the exact meaning of this. </p>
  
  <p>Please </p>