DMESG(8) BSD System Manager's Manual DMESG(8)
dmesg -- display the system message buffer
dmesg [-a] [-M core [-N system]]
The dmesg utility displays the contents of the system message buffer. If
the -M option is not specified, the buffer is read from the currently
running kernel via the sysctl(3) interface. Otherwise, the buffer is
read from the specified core file, using the name list from the specified
kernel image (or from the default image).
The options are as follows:
-a Show all data in the message buffer. This includes any syslog
records and /dev/console output.
-M Extract values associated with the name list from the specified
-N If -M is also specified, extract the name list from the specified
system instead of the default, which is the kernel image the sys-
tem has booted from.
/var/run/dmesg.boot usually a snapshot of the buffer contents taken soon
after file systems are mounted at startup time
The dmesg utility appeared in 4.0BSD.
BSD June 5, 1993 BSD