#include <sgtty.h>

main()
{
	struct sgttyb tty;

	/*
	 * Get the present terminal modes.
	 */
	ioctl(2, TIOCGETP, &tty);

	/*
	 * Set the erase character to '#' and
	 * turn echo off.
	 */
	tty.sg\(ulerase = '#';
	tty.sg\(ulflags &= ~ECHO;		/* '~' means "complement" */

	/*
	 * Set the new modes.
	 */
	ioctl(2, TIOCSETP, &tty);
}