UNIX Single-User Mode:
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This mode can be reached through the automatic reboot sequence, or by the user booting with the -s option or setting the boot_single variable in loader.
It can also be reached by calling shutdown(8) without the reboot (-r) or halt (-h) options, from multi-user mode.
If the system console is set to insecure in /etc/ttys, then the system prompts for the root password before initiating single-user mode.
Example 13-3. An Insecure Console in /etc/ttys
# name getty type status comments
#
# If console is marked "insecure", then init will ask for the root password
# when going to single-user mode.
console none unknown off insecure
Note: An insecure console means that you consider your physical security to the console to be insecure, and want to make sure only someone who knows the root password may use single-user mode, and it does not mean that you want to run your console insecurely. Thus, if you want security, choose insecure, not secure.
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This mode can be reached through the automatic reboot sequence, or by the user booting with the -s option or setting the boot_single variable in loader.
It can also be reached by calling shutdown(8) without the reboot (-r) or halt (-h) options, from multi-user mode.
If the system console is set to insecure in /etc/ttys, then the system prompts for the root password before initiating single-user mode.
Example 13-3. An Insecure Console in /etc/ttys
# name getty type status comments
#
# If console is marked "insecure", then init will ask for the root password
# when going to single-user mode.
console none unknown off insecure
Note: An insecure console means that you consider your physical security to the console to be insecure, and want to make sure only someone who knows the root password may use single-user mode, and it does not mean that you want to run your console insecurely. Thus, if you want security, choose insecure, not secure.
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