dmesg



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


NAME

     dmesg - display the system message buffer


SYNOPSIS

     dmesg [-s] [-M core] [-N system]


DESCRIPTION

     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.


FILES

     /var/run/dmesg.boot  copy of dmesg saved by rc(8) at boot time


SEE ALSO

     syslogd(8)


HISTORY

     The dmesg command appeared in 3BSD.

OpenBSD 6.2                     October 6, 2016                    OpenBSD 6.2

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