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Manual Reference Pages  - SECURETTY (5)

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securetty - file which lists ttys from which root can log in

CONTENTS

Description
Files

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.

/etc/securetty

login(1), login.defs(5)