rc1(1M) — ADMINISTRATOR COMMANDS
NAME
rc1 − run commands to bring system to administrative state
SYNOPSIS
/sbin/rc1
DESCRIPTION
The shell script rc1 is run whenever a transition to run state 1 is requested either through init 1 or shutdown −i 1.
File systems required for multi-user operations will be mounted at the end of rc1.
Entering this state is only meaningful when the system is coming up from the firmware state or the single-user state. When entering this state from the multi-user state [see rc2(1M)], no processes are killed and no services are stopped.
Note that in this state, logins requiring access to multi-user file systems can be used, but other multi-user services are unavailable.
SEE ALSO
init(1M), rc0(1M), rc2(1M), shutdown(1M), inittab(4).
— Essential Utilities