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

dmesg — display the system message buffer

dmesg [-s] [-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.
Display the contents of the console message buffer instead. This can be used to review rc(8) system startup messages. This option is limited to the superuser.

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

syslogd(8)

The dmesg command appeared in 4.0BSD.

January 13, 2015 OpenBSD-5.7