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authorKarel Zak2007-04-25 23:50:52 +0200
committerKarel Zak2007-04-25 23:50:52 +0200
commit2a4b57250050f0f4876b432deddd6b1f876e5bd2 (patch)
tree3a51fc65224974ff18fb363c31ffc42ca4943c38 /sys-utils/dmesg.1
parentdocs: fix info about devel/master branchs (diff)
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sys-utils: move some man pages from category 8 to 1
The dmesg, ipcrm, ipcs, renice and setsid are user-accessible commands and belong in man1 more than to man8. Signed-off-by: Karel Zak <kzak@redhat.com>
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+.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
+.\" May be distributed under the GNU General Public License
+.TH DMESG 8
+.SH NAME
+dmesg \- print or control the kernel ring buffer
+.SH SYNOPSIS
+.BI "dmesg [ \-c ] [ \-n " level " ] [ \-s " bufsize " ]"
+.SH DESCRIPTION
+.B dmesg
+is used to examine or control the kernel ring buffer.
+
+The program helps users to print out their bootup messages. Instead of
+copying the messages by hand, the user need only:
+.RS
+dmesg > boot.messages
+.RE
+and mail the
+.I boot.messages
+file to whoever can debug their problem.
+.SH OPTIONS
+.TP
+.B \-c
+Clear the ring buffer contents after printing.
+.TP
+.BI \-s bufsize
+Use a buffer of size
+.I bufsize
+to query the kernel ring buffer. This is 16392 by default.
+(The default kernel syslog buffer size was 4096
+at first, 8192 since 1.3.54, 16384 since 2.1.113.)
+If you have set the kernel buffer to be larger than the default
+then this option can be used to view the entire buffer.
+.TP
+.BI \-n level
+Set the
+.I level
+at which logging of messages is done to the console. For example,
+.B \-n 1
+prevents all messages, expect panic messages, from appearing on the
+console. All levels of messages are still written to
+.IR /proc/kmsg ,
+so
+.BR syslogd (8)
+can still be used to control exactly where kernel messages appear. When
+the
+.B \-n
+option is used,
+.B dmesg
+will
+.I not
+print or clear the kernel ring buffer.
+
+When both options are used, only the last option on the command line will
+have an effect.
+.SH SEE ALSO
+.BR syslogd (8)
+.\" .SH AUTHOR
+.\" Theodore Ts'o (tytso@athena.mit.edu)