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BSD 2.11 - man page for dmesg (bsd section 8)

DMESG(8)						      System Manager's Manual							  DMESG(8)

NAME
dmesg - collect system diagnostic messages to form error log
SYNOPSIS
/sbin/dmesg [ - ]
DESCRIPTION
N.B.: Dmesg is obsoleted by syslogd(8) for maintenance of the system error log. Dmesg looks in a system buffer for recently printed diagnostic messages and prints them on the standard output. The messages are those printed or logged by the system when errors occur. If the - flag is given, then dmesg computes (incrementally) the new messages since the last time it was run and places these on the standard output.
FILES
/usr/adm/msgbuf scratch file for memory of - option
SEE ALSO
syslogd(8) 4th Berkeley Distribution November 17, 1996 DMESG(8)