In Linux, inittab(5) is used to configure how many and which types of ttys are available; the BSD equivalent is ttys(5). In BSD you can also set a tty as "insecure," meaning it will not accept a superuser login. Setting the console (the first tty) to insecure will require the superuser password when the system drops down to single-user mode.

Figure C-2 Viewing file attributes after setting file flags

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