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STANDARD Printed by: Nora Chuang [nchuang] STANDARD

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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 savecore(1M) command and system

should be the corresponding kernel. If the sys-

tem 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