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DMESG(8) System Manager's Manual DMESG(8)

dmesg
display the system message buffer

dmesg [-M core] [-N system]

dmesg displays the contents of the system message buffer. It is most commonly used to review system startup messages.

The options are as follows:

core
Extract values associated with the name list from the specified core instead of the default /dev/kmem.
system
Extract the name list from the specified system instead of the default /bsd.

/var/run/dmesg.boot
copy of dmesg saved by rc(8) at boot time

syslogd(8)

The dmesg command appeared in 4.0BSD.
July 31, 2011 OpenBSD-5.1