DMESG(8) System Manager's Manual DMESG(8) NAME dmesg -- display the system message buffer SYNOPSIS dmesg [-a] [-M core] [-N system] DESCRIPTION The dmesg utility displays the contents of the system message buffer. If neither the -N nor the -M option is 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 (or from the default one), us- ing the name list from the specified kernel image (or from the default im- age). 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 core instead of the default /dev/kmem. -N Extract the name list from the specified system instead of the de- fault, which is the kernel image the system has booted from. FILES /var/run/dmesg.boot usually a snapshot of the buffer contents taken soon after file systems are mounted at startup time SEE ALSO sysctl(3), syslogd(8) HISTORY The dmesg utility appeared in 4.0BSD. FreeBSD 4.7 June 5, 1993 DMESG(8)
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