dmesg(1M) dmesg(1M)
NAME [Toc] [Back]
dmesg - collect system diagnostic messages to form error log
SYNOPSIS [Toc] [Back]
/usr/sbin/dmesg [-] [core] [system]
DESCRIPTION [Toc] [Back]
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 [Toc] [Back]
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 [Toc] [Back]
dmesg was developed by the University of California, Berkeley.
FILES [Toc] [Back]
/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 [Toc] [Back]
savecrash(1M).
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003 [ Back ] |
