ΤʻMini-HOWTO
======================

By rbean@execpc.com
last revised Dec. 1996

ܸ
 kikkawa@m.u-tokyo.ac.jp
last revised Jan. 1997


PCΥޥܡɾ˻ȤƤפΥåפϡΤǤ뤳ȤɤΤ
ƤޤLinuxˤϤΤΥեȥäơ㤨λפ̵Ƥ
פǽȤ*ȤƤ*Τˤ뤳ȤǤޤۤȤɤοͤϡ
ʲ˽Ҥ٤褦ʤĤͳǤΤȤΤʤ褦Ǥ

1: Ūʡhow to set up
linuxʸ¿ˤϽҤ٤Ƥʤޤ󥹥ȡΤȤ˼ưŪ˥
åȥåפΤ񤷤Ǥ롣ʥǥबŪˤԲǽǤϤʤ


2. ⤷'man
clock'å顢clock(3)Ĥޤꡢߤ̵ΤФƤ롣'man
8 clock'Ƥߤ

3. ¿οͤϡˤʤɤȤȤ򵤤ˤʤ褦

4.
֤򵤤ˤʤͤlouie.udel.eduȤäƤxntpdѥåȤ
ơλס㤨ХͥåȥॵС饸åȥ󥯥
Ȥ롣


mini-HOWTOϥƥˡˤĤƽ񤫤Ƥ롣⤷4.ˤ褦ˡ
Ĥƴؿʤ顢http://www.eecis.udel.edu/~ntp/Ƥߤ뤳Ȥ򶯤
᤹롣ʤ顢Τ⤷ʤΤžäƤ뤷xn
tpd˴ؤ봰ڤʾޤǤ뤷NISTUSNOؤΥ󥯤⤢롣xntpd
ؤƤϻ⤳ʸκǸˤ餫Ҥ٤Ƥ롣


NOTE:ʤΥޥǣİʾOSưƤˤϡΤΰĤ
CMOS
clock碌ʤȡߤOSĤƤޤޤLinuxWindowsƱ
ξξȤˤ˻ȤˤϡWindowsѤΥλץץ
Τɤ줫ȤäƤߤɤǤ礦ʾ嵭URL򤿤ɤäƤߤƤ


'clock'ץλȤ
=========================

   ɬפʤȤclock(8) man
page˽񤫤Ƥޤmini-HOWTOǤϡȤˡ򼨤ޤ

   NOTE:
'clock'¹Ԥꡢƥפ䡢CMOSפ¾Υץϡroo
t¤ưɬפޤ

󥹥ȡ뤷Ƥ뤫ɤΥå
======================================

   ƥ൯ưեˡ'clock -a'Ȥ'clock
-ua'Ȥ̵ƤߤƤɤΥǥȥӥ塼ȤäƤ뤫
äư㤤ޤưե/etc/rc.local/etc/rc.d/rc.sysinit
Ϥʴξˤޤ

   ⤷'clock -s'Ȥ'clock
-us'ȤƤ顢's''a'Ѥơ/etc/adjtime뤫ɤǧ
/etc/adjtimeˤϡʲΤ褦ʰԤ񤫤Ƥޤ

0.000000 842214901 0.000000


οϡ͡/ˡǸ˻פ蘆줿1970ǯ11
ÿɽ롣ˡפ碌ȤڤΤƤ줿ÿɽƤޤ
⤷Υե뤬̵СrootȤƥ󤷤ơΤ褦ʰԡ
ˤǡΥեƤ

0.0 0 0.0

   ơ'clock -a''clock
-ua'򥷥뤫ޥ˥奢Ǽ¹Ԥơܤο򹹿Ƥʥ
֤Ǥʤɸ˹碌ˤ'u'Ȥ


פζΨ¬ꤹ롣
========================

   ޤ߲Τɬפޤ :-).
ˤΤǤ̵Τޤ󡣻ΤϡWWVβʥ󥹤(
303)499-7111ʹȤǤʤޤ:ܤʤ117
󤳤ͭˤ⤷network time
server˥뤳ȤǤΤǤСxntpdѥå'ntpdate'
ȤȤǤޤʥͥ뤬CMOSפȤδ֤Ǻ𤷤ʤ褦
-bե饰Ȥޤ礦ˤǤʤС'date -s
hh:mm:ss'ǡͥλפưǥåȤơĤˡ'clock
-w'ǡͥλפCMOSפ碌ޤפ碌ä顢
դɤ̵ʤʤ褦ʤȤ˥⤷ƤΤ˺ʤǤ
⤷ntpdateȤäˤϡ'date
+%s'¹Ԥơ1970ǯ11ÿ⤷Ƥޤ礦


ơ뤤ϲ֤Ƥ顢פɤäƤ뤫򸫤뤳
ˤʤޤפǹ碌ˤϡʤȤ⣲֤Ԥääơ
0.1/̤ΤǻפζΤߤ׻褤Ǥ礦
ʤ0.01/餤Τǻפζ狼ޤʤäΤȤ
ͤ뤫Τޤ󤬡ϤǤݼŪ˸Ȥˤޤˤ⤷'ntp
date'ȤäˤϡۤĹԤɬפϤޤ󤬡ˤ
ǤäΤĴ뤳ȤǤޤ

   cron'clock
-a'餻뤳Ȥˤäơֳ֤ǥƥλפʳߤΡCMOS
Ĵ碌뤳ȤǤޤΥޥɤϥ֡Ȥ٤˥ȥåץ
뤫¹Ԥ뤳ȤǤޡ⤷Ӥӥ֡ȤΤǤС¿ʬ
ʤŪˤϽʬǤ


Υץϡƥפ٤1ðʾʤꡢ٤줿ꤹȤ
ޤƯʤȤޤΤ褦꤬ˤϡxntpdntpdate
äơäȽ˻פ碌뤳ȤǤޤ


====

פ碌
--------------

롼Ȥǥ󤹤롣
(303)499-7111ʲˤ뤹롣ʥ󥹤ʹ

date -s hh:mm:ss
򥿥פ롣
ʹޤenter򲡤ƤϤޤ
['date''ntpdate'ȤСä򤫤ʤƺѤߤޤ]
ǥͥλפ碌ޤ
Ĥ

clock -w

ȥפƤCMOSפ򥫡ͥפ˹碌ޤ

date +%j

ȥפ
[뤤ϡ ۤ'date''ntpdate'Ȥäˤ'date +%s]
ФƤ̤ο򼡤λΤ˥⤷ƤƤ


١פ碌ΨĴ٤롣
--------------------------------------

񤤤դǧ
rootǥ

clock -a

ȥפ롣ˤꡢͥλפϡߤCMOS֤ȹ礦褦˥å
롣

(303)499-7111 ()뤷ʥ󥹤ʹ

date

򥿥פơԤäƤ֤ˡ򥿥פơ󤬤ʤΤʹȤˡ
enter򲡤ǤޤäڤʤǡǡĤäȤˡԥ
λפϲäΤ狼ޤǤϡ

date hh:mm:00

ȡפƤ֤νϡʥ󥹤礦1ʬΤΤǡ
λʹȤˡenter򲡤Ƥʤ⤦äڤäƤ⹽ޤ
hhνˤϰɸȤäƤ'ͥ'碌ޤ


clock -w

ȥפơ˻CMOSפ碌ޤ
Ĥ:

date +%j
[뤤 Ʊ褦'date +%s'ȥפƤ]

ǣĤοʣĤաĤϻˤ줿櫓Ǥˤäơ
Ψ׻Ǥޤ

Ψη׻:
-------------

ʹȤ˽ФƤ'date'ϡʤǤޤ٤Ƥޤ
ʤǤˤϡäʤФʤʤΤǡο⤷Ƥ
⤷٤Ƥˤϡ­򤷤ʤФʤʤΤǡο
⤷Ƥ

ˡĤդκƤ'date
+%j'ѤˤϡϰǯΤǲܤ򼨤ƤޤʤǤ
1365οˤʤޤ뤦ǯξˤ1366ˤ⤷פ
Ƥ顢11ۤ顢365ʤޤ366ˤ2ܤο­Ƥ
⤷'date
+%s'ѤˤϡÿɽƤΤǡ86400ǳä
Ƥ

⤷Ψ/etc/adjtime˽񤫤Ƥˤϡɤ
Ƥ뤫׻ɬפޤ⤷줹Ƥˤϡ
ɷ׻ϡΨȤϵդˤʤäƤϤǤ­ʤ
ˤϡƱˤʤäƤϤǤŤΨݤơۤɵ
­ơͤƤޤơĤޤꡢ2Ĥο
Ʊʤ顢礭ʿˤʤޤ㤦ʤ龮ʿˤʤޤ

Ǹˡ͡áˤǳȡΨޤΤǡŤΨ
/etc/adjtime˽񤭽ФƤաäˤ⼡ΰ
˥⤷Ƥޤ礦

/etc/adjtimeϤˤʤäƤޤ:

-9.600000 845082716 -0.250655

[9.6/ȤȤϡ쥫ǡʬˤʤ뤳Ȥա]

xntpdˤĤƤ:
====================


ƥˤϣĤλפޤХåƥ꡼ư֥ꥢ륿ספ
ƥŸȤƤ֤֤³ΡCMOSסϡ
ס뤤RTCȤΤƤޤˤ줫顢ͥסʥ
եȥפȤƥפȤƤФޤˤϡ֡ȻCMOS
˻֤¬Ϥᡢޡߤ˴ŤƤƤޤΣĤϤ
ۤʤä򤷤Ƥꡢߤ˾ĶäƤޤ
Ρ׻֤ⶸäƤޤ


xntpdʸˤơֻספϾˡ֥ͥספΤȤؤƤޤxnptd
䡢timedʤ뤤ϡ'adjtimex'ƥॳȤץʤɤǤ
餻ˤϡlinuxͥϡCMOSפ⥫ͥפΤ
ȲꤷޤơCMOSפ򤽤ʸ11ʬ˥ͥפ˹碌³ޤ
ʼ֡ȤޤǡˤĤޤꡢ'clock'󤤤CMOSפ碌줿
狼ʤΤǤǤ顢/etc/adjtimeȤޤ'ntpdate'Ȥư
եǤ餫֤碌ƤС'xnpd'ȤȤǤޤ
ưˤĤΤʻפ˥뤳ȤǤʤˤϡˡ
ΩޤxnpdϤΤ褦ʾͤ߷פƤʤΤǤ


Xnptdϡ¿̵פФƤΥɥ饤СѰդƤꡢδֳ֤NIST
Υ륢å׻掠ӥƤӽФ褦ǤޤʸƤӽФδֳ֤
äФƵڤܤƶɤͤ褦ˡˤ⤷ʾ¾λ
٤뤳ȤǤʤˤϡͥפФԤޤ


ۤȤɤ̵פ$3,000-$4000ޤäȤʼºݤˤ300ܡ
ΥǥˤǤʤΥԥ塼ȡʥCHUɡftp://ftp.udel.edu/pu
b/ntp/gadget.tar.Z򸫤衣ˤμȿ˹碌ûȥ饸ĤʤǤȤޤ
Heathkit
WWVʡ֤äȤΤʻססˤ$4-500ǡȤȤǤޤʥå
ȤƤǤϤޤ󤬡GPSˤϻξäƤơĤGPS
ϥꥢݡȤˤĤʤȤǤޤŪˤϤ¤
褦ˤʤǤ礦


ŪˤϡïNISTΥ륢å׻掠ӥȤäơCMOSפȥ
פξζΨ׻ץ񤯤ȤǤϤǤ伫Ȥ
ñȤǤΤ褦ʤȤԤץΤޤ󤬡äȤۤȤɤΥ
xntpd뤳ȤǤ˰㤤ޤ

