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. 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:
-M
core- Extract values associated with the name list from the specified
core instead of the default
/dev/kmem.
-N
system- Extract the name list from the specified system
instead of the default /bsd.
-s- 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
The dmesg command appeared in
3BSD.