How to detect single user mode in FreeBSD ?

Steve O'Hara-Smith steve at
Wed Jun 13 13:12:33 UTC 2018

On Wed, 13 Jun 2018 18:04:08 +0530
Manish Jain <jude.obscure at> wrote:

> Tx for replying. But don't you think there should ideally be a sysctl to 
> be detect the runlevel, particularly single user mode ? It makes things 

	The runlevel concept comes from sysV init, it isn't a BSD thing at
all. There isn't a real difference at all between single user and multi
user. Single user mode is really just one of two states - before enabling
ttys and running the rc scripts with start or after disabling the ttys and
running the rc.shutdown script. There's nothing special about it.

	If you feel a need to test for single user then you should probably
be testing for something else - such as whether a filesystem is mounted
before running fsck on it which is what really matters and is completely
independent of whether or not the system is running multi-user.

Steve O'Hara-Smith <steve at>

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