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

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. On some systems the message buffer can survive reboot and be retained (in the hope of exposing information from a crash).
The options are as follows:
Extract values associated with the name list from the specified core instead of the default /dev/kmem.
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.

copy of dmesg saved by rc(8) at boot time


The dmesg command appeared in 4.0BSD.
March 13, 2015 OpenBSD-6.0