The file /etc/securetty is used by (some versions of) login(1). The
file contains the device names of terminal lines (one per line, without
leading /dev/) on which root is allowed to login. See login.defs(5) if
you use the shadow suite.
This page is part of release 3.54 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 1992-12-29 SECURETTY(5)
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