Su root or login root

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Operating Systems Linux Red Hat Su root or login root
# 15  
Old 03-29-2014
If the user running the command has a uid of zero that is enough to succeed.

And these modules should all have man pages. At least they do on RedHat.
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SECURETTY(5)						     Linux Programmer's Manual						      SECURETTY(5)

securetty - file which lists terminals from which root can log in DESCRIPTION
The file /etc/securetty contains the names of terminals (one per line, without leading /dev/) which are considered secure for the transmis- sion of certain authentication tokens. It is used by (some versions of) login(1) to restrict the terminals on which root is allowed to login. See login.defs(5) if you use the shadow suite. On PAM enabled systems, it is used for the same purpose by pam_securetty(8) to restrict the terminals on which empty passwords are accepted. FILES
/etc/securetty SEE ALSO
login(1), login.defs(5), pam_securetty(8) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at Linux 2015-03-29 SECURETTY(5)