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1 perry 1 DMESG
2 !!!DMESG
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 OPTIONS
7 SEE ALSO
8 AUTHOR
9 ----
10 !!NAME
11
12
13 dmesg - print or control the kernel ring buffer
14 !!SYNOPSIS
15
16
17 __dmesg [[ -c ] [[ -n__ ''level'' __] [[ -s__
18 ''bufsize'' __]__
19 !!DESCRIPTION
20
21
22 __dmesg__ is used to examine or control the kernel ring
23 buffer.
24
25
26 The program helps users to print out their bootup messages.
27 Instead of copying the messages by hand, the user need
28 only:
29
30
31 dmesg
32
33
34 and mail the ''boot.messages'' file to whoever can debug
35 their problem.
36 !!OPTIONS
37
38
39 __-c__
40
41
42 Clear the ring buffer contents after printing.
43
44
45 __-s__''bufsize''
46
47
48 Use a buffer of size ''bufsize'' to query the kernel ring
49 buffer. This is 16392 by default. (The default kernel syslog
50 buffer size was 4096 at first, 8192 since 1.3.54, 16384
51 since 2.1.113.) If you have set the kernel buffer to be
52 larger than the default then this option can be used to view
53 the entire buffer.
54
55
56 __-n__''level''
57
58
59 Set the ''level'' at which logging of messages is done to
60 the console. For example, __-n 1__ prevents all messages,
61 expect panic messages, from appearing on the console. All
62 levels of messages are still written to ''/proc/kmsg'',
63 so syslogd(8) can still be used to control exactly
64 where kernel messages appear. When the __-n__ option is
65 used, __dmesg__ will ''not'' print or clear the kernel
66 ring buffer.
67
68
69 When both options are used, only the last option on the
70 command line will have an effect.
71 !!SEE ALSO
72
73
74 syslogd(8)
75 !!AUTHOR
76
77
78 Theodore Ts'o (tytso@athena.mit.edu)
79 ----
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