V8/usr/man/man8/dmesg.8

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.TH DMESG 8
.SH NAME
dmesg \- system diagnostic messages
.SH SYNOPSIS
.B /etc/dmesg
[
.B \-
]
[
.B \-i
]
[ core namelist ]
.SH DESCRIPTION
.I Dmesg
looks in a system buffer for recent kernel diagnostic messages
and reproduces them on the standard output.
If the
.B \-
flag is given,
.I dmesg
produces only those messages printed by the system
since the last time `\fIdmesg\fP\ \-'
was run.
This can be used with
.IR cron (8)
to produce the error log
.I /usr/adm/messages
by running the command
.IP
/etc/dmesg \- >> /usr/adm/messages
.LP
periodically.
.PP
If
.B \-i
is given,
messages produced since the last
.I "dmesg \-"
are printed;
the memory of which messages have been recorded
is not changed.
.PP
If
.I core
and
.I namelist
are specified,
they are used in place of
.I /dev/kmem
and
.IR /unix .
.SH FILES
.ta 2i
/usr/adm/messages	error log
.br
/usr/adm/msgbuf	scratch file for memory of \- option
.SH BUGS
Since the system error message buffer is of small finite size,
not all error messages
are guaranteed to be logged.
.PP
Error diagnostics generated immediately before a system crash cannot be logged.