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dmesg man page

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DMESG(8)                FreeBSD 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
     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
             core.

     -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.


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 6.2                      June 5, 1993                      FreeBSD 6.2


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This page was generated on Wed Sep 19 20:34:52 BST 2007

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