HP-UX Reference (11i v1 05/09) - 1M System Administration Commands A-M (vol 3)

d
dmesg(1M) dmesg(1M)
NAME
dmesg - collect system diagnostic messages to form error log
SYNOPSIS
/usr/sbin/dmesg
[-][core][system]
DESCRIPTION
dmesg looks in a system buffer for recently printed diagnostic messages and prints them on the standard
output. The messages are those printed by the system when unusual events occur (such as when system
tables overflow or the system crashes). If the
- argument is specified, dmesg computes (incrementally)
the new messages since the last time it was run and places these on the standard output. This is typically
used with
cron (see cron(1)) to produce the error log
/var/adm/messages
by running the command:
/usr/sbin/dmesg - >> /var/adm/messages
every 10 minutes.
The arguments core and system allow substitution for the defaults
/dev/kmem and
/stand/vmunix respectively,
where core should be a file containing the image of the kernel virtual
memory saved by the savecrash(1M) command and
system should be the corresponding kernel. If the
system is booted with a kernel other than /stand/vmunix say /stand/vmunix_new,
dmesg must be passed
this name, the command must be,
/usr/sbin/dmesg [-] /dev/kmem /stand/vmunix_new
WARNINGS
The system error message buffer is of small, finite size. dmesg is run only every few minutes, so there is
no guarantee that all error messages will be logged.
AUTHOR
dmesg was developed by the University of California, Berkeley.
FILES
/var/adm/messages
error log (conventional location)
/var/adm/msgbuf memory scratch file for
- option
/dev/kmem special file containing the image of kernel virtual memory
/stand/vmunix the kernel, system name list
SEE ALSO
savecrash(1M).
Section 1M−−182 Hewlett-Packard Company − 1 − HP-UX 11i Version 1: September 2005