BSD systems don't use runlevels or a subdirectory structure containing scripts for each runlevel. Instead, a single configuration file, /etc/rc.conf, is used to determine which services start at boot time. Additionally, this file contains security settings that can be implemented at boot time. Some of these include:
• Disabling the operating system being revealed in motd
• Setting the securelevel
• Loading a firewall ruleset
The available configuration settings vary by BSD and are detailed in rc.conf(5) on FreeBSD and NetBSD and rc.conf(8) on OpenBSD.
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