| ntpdate.html (302408) | ntpdate.html (338530) |
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| 1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3<head> 4<meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> 5<meta name="generator" content="HTML Tidy, see www.w3.org"> 6<title>ntpdate - set the date and time via NTP</title> 7<link href="scripts/style.css" type="text/css" rel="stylesheet"> 8</head> 9<body> 10<h3><tt>ntpdate</tt> - set the date and time via NTP</h3> 11<img src="pic/rabbit.gif" alt="gif" align="left"><a href="http://www.eecis.udel.edu/~mills/pictures.html">from <i>Alice's Adventures in Wonderland</i>, Lewis Carroll</a> 12<p>I told you it was eyeball and wristwatch.</p> 13<p>Last update: | 1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<html> 3<head> 4<meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> 5<meta name="generator" content="HTML Tidy, see www.w3.org"> 6<title>ntpdate - set the date and time via NTP</title> 7<link href="scripts/style.css" type="text/css" rel="stylesheet"> 8</head> 9<body> 10<h3><tt>ntpdate</tt> - set the date and time via NTP</h3> 11<img src="pic/rabbit.gif" alt="gif" align="left"><a href="http://www.eecis.udel.edu/~mills/pictures.html">from <i>Alice's Adventures in Wonderland</i>, Lewis Carroll</a> 12<p>I told you it was eyeball and wristwatch.</p> 13<p>Last update: |
| 14 <!-- #BeginDate format:En2m -->9-Feb-2014 03:34<!-- #EndDate --> | 14 <!-- #BeginDate format:En2m -->21-Jul-2018 04:09<!-- #EndDate --> |
| 15 UTC</p> 16<br clear="left"> 17<hr> 18<p>Disclaimer: This program has known bugs and deficiencies and nobody 19has volunteered to fix them in a long time. The good news is the 20functionality originally intended for this program is available in the <tt>ntpd</tt> and 21<tt>sntp</tt> programs. See the <a 22href="http://support.ntp.org/Dev/DeprecatingNtpdate">Deprecating --- 35 unchanged lines hidden (view full) --- 58 <i>version</i>, which can be 1, 2, 3 or 4. The default is 4. This allows <tt>ntpdate</tt> to be used with older NTP versions.</dd> 59 <dt><tt>-p <i>samples</i></tt></dt> 60 <dd>Specify the number of samples to be acquired from each server as the integer <i>samples</i>, with values from 1 to 8 inclusive. The default is 4.</dd> 61 <dt><i><tt>-q</tt></i></dt> 62 <dd>Query only - don't set the clock.</dd> 63 <dt><tt>-s</tt></dt> 64 <dd>Divert logging output from the standard output (default) to the system <tt>syslog</tt> facility. This is designed primarily for convenience of <tt>cron</tt> scripts.</dd> 65 <dt><tt>-t <i>timeout</i></tt></dt> | 15 UTC</p> 16<br clear="left"> 17<hr> 18<p>Disclaimer: This program has known bugs and deficiencies and nobody 19has volunteered to fix them in a long time. The good news is the 20functionality originally intended for this program is available in the <tt>ntpd</tt> and 21<tt>sntp</tt> programs. See the <a 22href="http://support.ntp.org/Dev/DeprecatingNtpdate">Deprecating --- 35 unchanged lines hidden (view full) --- 58 <i>version</i>, which can be 1, 2, 3 or 4. The default is 4. This allows <tt>ntpdate</tt> to be used with older NTP versions.</dd> 59 <dt><tt>-p <i>samples</i></tt></dt> 60 <dd>Specify the number of samples to be acquired from each server as the integer <i>samples</i>, with values from 1 to 8 inclusive. The default is 4.</dd> 61 <dt><i><tt>-q</tt></i></dt> 62 <dd>Query only - don't set the clock.</dd> 63 <dt><tt>-s</tt></dt> 64 <dd>Divert logging output from the standard output (default) to the system <tt>syslog</tt> facility. This is designed primarily for convenience of <tt>cron</tt> scripts.</dd> 65 <dt><tt>-t <i>timeout</i></tt></dt> |
| 66 <dd>Specify the maximum time waiting for a server response as the value <i>timeout</i>, in seconds and fraction. The value is is rounded to a multiple of 0.2 seconds. The default is 1 second, a value suitable for polling across a LAN.</dd> | 66 <dd>Specify the maximum time waiting for a server response as the value <i>timeout</i>, in seconds and fraction. The value is is rounded to a multiple of 0.2 seconds. The default is 2 seconds, a value suitable for polling across a LAN.</dd> |
| 67 <dt><tt>-u</tt></dt> 68 <dd>Direct <tt>ntpdate</tt> to use an unprivileged port for outgoing packets. This is most useful when behind a firewall that blocks incoming traffic to privileged ports, and you want to synchronize with hosts beyond the firewall. Note that the <tt>-d</tt> option always uses unprivileged ports. 69 <dt><tt>-<i>v</i></tt></dt> 70 <dd>Be verbose. This option will cause <tt>ntpdate</tt>'s version identification string to be logged.</dd> 71</dl> 72<h4>Diagnostics</h4> 73<tt>ntpdate</tt>'s exit status is zero if it finds a server and updates the clock, and nonzero otherwise. 74<h4>Files</h4> 75<tt>/etc/ntp.keys</tt> - encryption keys used by <tt>ntpdate</tt>. 76<h4>Bugs</h4> 77The slew adjustment is actually 50% larger than the measured offset, since this (it is argued) will tend to keep a badly drifting clock more accurate. This is probably not a good idea and may cause a troubling hunt for some values of the kernel variables <tt>tick</tt> and <tt>tickadj</tt>. 78<hr> 79<script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 80</body> 81</html> | 67 <dt><tt>-u</tt></dt> 68 <dd>Direct <tt>ntpdate</tt> to use an unprivileged port for outgoing packets. This is most useful when behind a firewall that blocks incoming traffic to privileged ports, and you want to synchronize with hosts beyond the firewall. Note that the <tt>-d</tt> option always uses unprivileged ports. 69 <dt><tt>-<i>v</i></tt></dt> 70 <dd>Be verbose. This option will cause <tt>ntpdate</tt>'s version identification string to be logged.</dd> 71</dl> 72<h4>Diagnostics</h4> 73<tt>ntpdate</tt>'s exit status is zero if it finds a server and updates the clock, and nonzero otherwise. 74<h4>Files</h4> 75<tt>/etc/ntp.keys</tt> - encryption keys used by <tt>ntpdate</tt>. 76<h4>Bugs</h4> 77The slew adjustment is actually 50% larger than the measured offset, since this (it is argued) will tend to keep a badly drifting clock more accurate. This is probably not a good idea and may cause a troubling hunt for some values of the kernel variables <tt>tick</tt> and <tt>tickadj</tt>. 78<hr> 79<script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 80</body> 81</html> |