SECURETTY(5) Linux Programmer's Manual SECURETTY(5)
securetty - file which lists ttys from which root can log in
The file /etc/securetty is used by (some versions of) login(1). The
file contains the device names of tty lines (one per line, without
leading /dev/) on which root is allowed to login. See login.defs(5) if
you use the shadow suite.
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Linux 1992-12-29 SECURETTY(5)