dmesg man page on FreeBSD

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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

     sysctl(3), syslogd(8)

     The dmesg utility appeared in 4.0BSD.

BSD				 June 5, 1993				   BSD

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