使用ntpdate校正Linux系统的时间

ntpdate简单用法：

# ntpdate ip

# ntpdate 210.72.145.44

以下是一些可用的NTP服务器地址：

Name

  IP   Location  
210.72.145.44   210.72.145.44   中国（国家授时中心）  
133.100.11.8   133.100.11.8   日本（福冈大学）  
time-a.nist.gov   129.6.15.28   NIST,Gaithersburg,Maryland  
time-b.nist.gov   129.6.15.29   NIST,Gaithersburg,Maryland  
time-a.timefreq.bldrdoc.gov   132.163.4.101   NIST,Boulder,Colorado  
time-b.timefreq.bldrdoc.gov   132.163.4.102   NIST,Boulder,Colorado  
time-c.timefreq.bldrdoc.gov   132.163.4.103   NIST,Boulder,Colorado  
utcnist.colorado.edu   128.138.140.44   UniversityofColorado,Boulder  
time.nist.gov   192.43.244.18   NCAR,Boulder,Colorado  
time-nw.nist.gov   131.107.1.10   Microsoft,Redmond,Washington  
nist1.symmetricom.com   69.25.96.13   Symmetricom,SanJose,California  
nist1-dc.glassey.com   216.200.93.8   Abovenet,Virginia  
nist1-ny.glassey.com   208.184.49.9   Abovenet,NewYorkCity  
nist1-sj.glassey.com   207.126.98.204   Abovenet,SanJose,California  
nist1.aol-ca.truetime.com   207.200.81.113   TrueTime,AOLfacility,Sunnyvale,California  
nist1.aol-va.truetime.com   64.236.96.53   TrueTime,AOLfacility,Virginia