052d159a8b
4.2.8p12 --> 4.2.8p13 MFC after: immediately Security: CVE-2019-8936 VuXML: c2576e14-36e2-11e9-9eda-206a8a720317 Obtained from: nwtime.org
591 lines
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591 lines
25 KiB
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<h1 class="settitle" align="center">ntpdc: NTPD Control User’s Manual</h1>
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<a name="Top"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-Description" accesskey="n" rel="next">ntpdc Description</a>, Previous: <a href="dir.html#Top" accesskey="p" rel="prev">(dir)</a>, Up: <a href="dir.html#Top" accesskey="u" rel="up">(dir)</a> </p>
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</div>
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<a name="ntpdc_003a-NTPD-Control-User-Manual"></a>
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<h1 class="top">ntpdc: NTPD Control User Manual</h1>
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<p>This document describes the use of the NTP Project’s <code>ntpdc</code> program,
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that can be used to query a Network Time Protocol (NTP) server and
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display the time offset of the system clock relative to the server
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clock. Run as root, it can correct the system clock to this offset as
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well. It can be run as an interactive command or from a cron job.
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</p>
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<p>This document applies to version 4.2.8p13 of <code>ntpdc</code>.
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</p>
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<p>The program implements the SNTP protocol as defined by RFC 5905, the NTPv4
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IETF specification.
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</p>
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<a name="SEC_Overview"></a>
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<h2 class="shortcontents-heading">Short Table of Contents</h2>
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<div class="shortcontents">
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<ul class="no-bullet">
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<li><a name="stoc-Description" href="#toc-Description">1 Description</a></li>
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</ul>
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</div>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="#ntpdc-Description" accesskey="1">ntpdc Description</a>:</td><td> </td><td align="left" valign="top">Description
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-Invocation" accesskey="2">ntpdc Invocation</a>:</td><td> </td><td align="left" valign="top">Invoking ntpdc
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#Usage" accesskey="3">Usage</a>:</td><td> </td><td align="left" valign="top">Usage
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</td></tr>
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</table>
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<hr>
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<a name="ntpdc-Description"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-Invocation" accesskey="n" rel="next">ntpdc Invocation</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> </p>
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</div>
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<a name="Description"></a>
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<h2 class="chapter">1 Description</h2>
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<p>By default, <code>ntpdc</code> writes the local data and time (i.e., not UTC) to the
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standard output in the format:
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</p>
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<div class="example">
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<pre class="example">1996-10-15 20:17:25.123 (+0800) +4.567 +/- 0.089 secs
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</pre></div>
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<p>where
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YYYY-MM-DD HH:MM:SS.SUBSEC is the local date and time,
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(+0800) is the local timezone adjustment (so we would add 8 hours and 0 minutes to convert the reported local time to UTC),
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and
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the +4.567 +/- 0.089 secs indicates the time offset and
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error bound of the system clock relative to the server clock.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="#ntpdc-Invocation" accesskey="1">ntpdc Invocation</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#Usage" accesskey="2">Usage</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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<hr>
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<a name="ntpdc-Invocation"></a>
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<div class="header">
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<p>
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Next: <a href="#Usage" accesskey="n" rel="next">Usage</a>, Previous: <a href="#ntpdc-Description" accesskey="p" rel="prev">ntpdc Description</a>, Up: <a href="#ntpdc-Description" accesskey="u" rel="up">ntpdc Description</a> </p>
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</div>
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<a name="Invoking-ntpdc"></a>
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<h3 class="section">1.1 Invoking ntpdc</h3>
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<a name="index-ntpdc"></a>
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<a name="index-vendor_002dspecific-NTPD-control-program"></a>
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<p><code>ntpdc</code>
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is deprecated.
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Please use
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<code>ntpq(1ntpqmdoc)</code> instead - it can do everything
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<code>ntpdc</code>
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used to do, and it does so using a much more sane interface.
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</p>
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<p><code>ntpdc</code>
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is a utility program used to query
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<code>ntpd(1ntpdmdoc)</code>
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about its
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current state and to request changes in that state.
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It uses NTP mode 7 control message formats described in the source code.
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The program may
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be run either in interactive mode or controlled using command line
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arguments.
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Extensive state and statistics information is available
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through the
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<code>ntpdc</code>
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interface.
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In addition, nearly all the
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configuration options which can be specified at startup using
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ntpd’s configuration file may also be specified at run time using
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<code>ntpdc</code>
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</p>
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<p>This section was generated by <strong>AutoGen</strong>,
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using the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntpdc</code> program.
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This software is released under the NTP license, <http://ntp.org/license>.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="#ntpdc-usage" accesskey="1">ntpdc usage</a>:</td><td> </td><td align="left" valign="top">ntpdc help/usage (<samp>--help</samp>)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-ipv4" accesskey="2">ntpdc ipv4</a>:</td><td> </td><td align="left" valign="top">ipv4 option (-4)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-ipv6" accesskey="3">ntpdc ipv6</a>:</td><td> </td><td align="left" valign="top">ipv6 option (-6)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-command" accesskey="4">ntpdc command</a>:</td><td> </td><td align="left" valign="top">command option (-c)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-interactive" accesskey="5">ntpdc interactive</a>:</td><td> </td><td align="left" valign="top">interactive option (-i)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-listpeers" accesskey="6">ntpdc listpeers</a>:</td><td> </td><td align="left" valign="top">listpeers option (-l)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-numeric" accesskey="7">ntpdc numeric</a>:</td><td> </td><td align="left" valign="top">numeric option (-n)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-peers" accesskey="8">ntpdc peers</a>:</td><td> </td><td align="left" valign="top">peers option (-p)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-showpeers" accesskey="9">ntpdc showpeers</a>:</td><td> </td><td align="left" valign="top">showpeers option (-s)
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-config">ntpdc config</a>:</td><td> </td><td align="left" valign="top">presetting/configuring ntpdc
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-exit-status">ntpdc exit status</a>:</td><td> </td><td align="left" valign="top">exit status
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-Usage">ntpdc Usage</a>:</td><td> </td><td align="left" valign="top">Usage
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-See-Also">ntpdc See Also</a>:</td><td> </td><td align="left" valign="top">See Also
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-Authors">ntpdc Authors</a>:</td><td> </td><td align="left" valign="top">Authors
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</td></tr>
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<tr><td align="left" valign="top">• <a href="#ntpdc-Bugs">ntpdc Bugs</a>:</td><td> </td><td align="left" valign="top">Bugs
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</td></tr>
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</table>
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<hr>
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<a name="ntpdc-usage"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-ipv4" accesskey="n" rel="next">ntpdc ipv4</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="ntpdc-help_002fusage-_0028_002d_002dhelp_0029"></a>
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<h4 class="subsection">1.1.1 ntpdc help/usage (<samp>--help</samp>)</h4>
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<a name="index-ntpdc-help"></a>
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<p>This is the automatically generated usage text for ntpdc.
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</p>
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<p>The text printed is the same whether selected with the <code>help</code> option
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(<samp>--help</samp>) or the <code>more-help</code> option (<samp>--more-help</samp>). <code>more-help</code> will print
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the usage text by passing it through a pager program.
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<code>more-help</code> is disabled on platforms without a working
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<code>fork(2)</code> function. The <code>PAGER</code> environment variable is
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used to select the program, defaulting to <samp>more</samp>. Both will exit
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with a status code of 0.
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</p>
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<div class="example">
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<pre class="example">ntpdc - vendor-specific NTPD control program - Ver. 4.2.8p13
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Usage: ntpdc [ -<flag> [<val>] | --<name>[{=| }<val>] ]... [ host ...]
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Flg Arg Option-Name Description
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-4 no ipv4 Force IPv4 DNS name resolution
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- prohibits the option 'ipv6'
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-6 no ipv6 Force IPv6 DNS name resolution
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- prohibits the option 'ipv4'
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-c Str command run a command and exit
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- may appear multiple times
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-d no debug-level Increase debug verbosity level
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- may appear multiple times
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-D Num set-debug-level Set the debug verbosity level
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- may appear multiple times
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-i no interactive Force ntpq to operate in interactive mode
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- prohibits these options:
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command
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listpeers
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peers
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showpeers
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-l no listpeers Print a list of the peers
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- prohibits the option 'command'
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-n no numeric numeric host addresses
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-p no peers Print a list of the peers
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- prohibits the option 'command'
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-s no showpeers Show a list of the peers
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- prohibits the option 'command'
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opt version output version information and exit
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-? no help display extended usage information and exit
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-! no more-help extended usage information passed thru pager
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-> opt save-opts save the option state to a config file
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-< Str load-opts load options from a config file
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- disabled as '--no-load-opts'
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- may appear multiple times
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Options are specified by doubled hyphens and their name or by a single
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hyphen and the flag character.
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The following option preset mechanisms are supported:
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- reading file $HOME/.ntprc
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- reading file ./.ntprc
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- examining environment variables named NTPDC_*
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Please send bug reports to: <http://bugs.ntp.org, bugs@ntp.org>
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</pre></div>
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<hr>
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<a name="ntpdc-ipv4"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-ipv6" accesskey="n" rel="next">ntpdc ipv6</a>, Previous: <a href="#ntpdc-usage" accesskey="p" rel="prev">ntpdc usage</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="ipv4-option-_0028_002d4_0029"></a>
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<h4 class="subsection">1.1.2 ipv4 option (-4)</h4>
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<a name="index-ntpdc_002dipv4"></a>
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<p>This is the “force ipv4 dns name resolution” option.
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</p>
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<p>This option has some usage constraints. It:
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</p><ul>
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<li> must not appear in combination with any of the following options:
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ipv6.
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</li></ul>
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<p>Force DNS resolution of following host names on the command line
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to the IPv4 namespace.
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</p><hr>
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<a name="ntpdc-ipv6"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-command" accesskey="n" rel="next">ntpdc command</a>, Previous: <a href="#ntpdc-ipv4" accesskey="p" rel="prev">ntpdc ipv4</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="ipv6-option-_0028_002d6_0029"></a>
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<h4 class="subsection">1.1.3 ipv6 option (-6)</h4>
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<a name="index-ntpdc_002dipv6"></a>
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<p>This is the “force ipv6 dns name resolution” option.
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</p>
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<p>This option has some usage constraints. It:
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</p><ul>
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<li> must not appear in combination with any of the following options:
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ipv4.
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</li></ul>
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<p>Force DNS resolution of following host names on the command line
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to the IPv6 namespace.
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</p><hr>
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<a name="ntpdc-command"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-interactive" accesskey="n" rel="next">ntpdc interactive</a>, Previous: <a href="#ntpdc-ipv6" accesskey="p" rel="prev">ntpdc ipv6</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="command-option-_0028_002dc_0029"></a>
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<h4 class="subsection">1.1.4 command option (-c)</h4>
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<a name="index-ntpdc_002dcommand"></a>
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<p>This is the “run a command and exit” option.
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This option takes a string argument <samp>cmd</samp>.
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</p>
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<p>This option has some usage constraints. It:
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</p><ul>
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<li> may appear an unlimited number of times.
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</li></ul>
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<p>The following argument is interpreted as an interactive format command
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and is added to the list of commands to be executed on the specified
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host(s).
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</p><hr>
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<a name="ntpdc-interactive"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-listpeers" accesskey="n" rel="next">ntpdc listpeers</a>, Previous: <a href="#ntpdc-command" accesskey="p" rel="prev">ntpdc command</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="interactive-option-_0028_002di_0029"></a>
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<h4 class="subsection">1.1.5 interactive option (-i)</h4>
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<a name="index-ntpdc_002dinteractive"></a>
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<p>This is the “force ntpq to operate in interactive mode” option.
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</p>
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<p>This option has some usage constraints. It:
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</p><ul>
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<li> must not appear in combination with any of the following options:
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command, listpeers, peers, showpeers.
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</li></ul>
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<p>Force ntpq to operate in interactive mode. Prompts will be written
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to the standard output and commands read from the standard input.
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</p><hr>
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<a name="ntpdc-listpeers"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-numeric" accesskey="n" rel="next">ntpdc numeric</a>, Previous: <a href="#ntpdc-interactive" accesskey="p" rel="prev">ntpdc interactive</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="listpeers-option-_0028_002dl_0029"></a>
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<h4 class="subsection">1.1.6 listpeers option (-l)</h4>
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<a name="index-ntpdc_002dlistpeers"></a>
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<p>This is the “print a list of the peers” option.
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</p>
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<p>This option has some usage constraints. It:
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</p><ul>
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<li> must not appear in combination with any of the following options:
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command.
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</li></ul>
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<p>Print a list of the peers known to the server as well as a summary of
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their state. This is equivalent to the ’listpeers’ interactive command.
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</p><hr>
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<a name="ntpdc-numeric"></a>
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<div class="header">
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<p>
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Next: <a href="#ntpdc-peers" accesskey="n" rel="next">ntpdc peers</a>, Previous: <a href="#ntpdc-listpeers" accesskey="p" rel="prev">ntpdc listpeers</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
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</div>
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<a name="numeric-option-_0028_002dn_0029"></a>
|
|
<h4 class="subsection">1.1.7 numeric option (-n)</h4>
|
|
<a name="index-ntpdc_002dnumeric"></a>
|
|
|
|
<p>This is the “numeric host addresses” option.
|
|
Output all host addresses in dotted-quad numeric format rather than
|
|
converting to the canonical host names.
|
|
</p><hr>
|
|
<a name="ntpdc-peers"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-showpeers" accesskey="n" rel="next">ntpdc showpeers</a>, Previous: <a href="#ntpdc-numeric" accesskey="p" rel="prev">ntpdc numeric</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="peers-option-_0028_002dp_0029"></a>
|
|
<h4 class="subsection">1.1.8 peers option (-p)</h4>
|
|
<a name="index-ntpdc_002dpeers"></a>
|
|
|
|
<p>This is the “print a list of the peers” option.
|
|
</p>
|
|
<p>This option has some usage constraints. It:
|
|
</p><ul>
|
|
<li> must not appear in combination with any of the following options:
|
|
command.
|
|
</li></ul>
|
|
|
|
<p>Print a list of the peers known to the server as well as a summary
|
|
of their state. This is equivalent to the ’peers’ interactive command.
|
|
</p><hr>
|
|
<a name="ntpdc-showpeers"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-config" accesskey="n" rel="next">ntpdc config</a>, Previous: <a href="#ntpdc-peers" accesskey="p" rel="prev">ntpdc peers</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="showpeers-option-_0028_002ds_0029"></a>
|
|
<h4 class="subsection">1.1.9 showpeers option (-s)</h4>
|
|
<a name="index-ntpdc_002dshowpeers"></a>
|
|
|
|
<p>This is the “show a list of the peers” option.
|
|
</p>
|
|
<p>This option has some usage constraints. It:
|
|
</p><ul>
|
|
<li> must not appear in combination with any of the following options:
|
|
command.
|
|
</li></ul>
|
|
|
|
<p>Print a list of the peers known to the server as well as a summary
|
|
of their state. This is equivalent to the ’dmpeers’ interactive command.
|
|
</p>
|
|
|
|
<hr>
|
|
<a name="ntpdc-config"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-exit-status" accesskey="n" rel="next">ntpdc exit status</a>, Previous: <a href="#ntpdc-showpeers" accesskey="p" rel="prev">ntpdc showpeers</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="presetting_002fconfiguring-ntpdc"></a>
|
|
<h4 class="subsection">1.1.10 presetting/configuring ntpdc</h4>
|
|
|
|
<p>Any option that is not marked as <i>not presettable</i> may be preset by
|
|
loading values from configuration ("rc" or "ini") files, and values from environment variables named <code>NTPDC</code> and <code>NTPDC_<OPTION_NAME></code>. <code><OPTION_NAME></code> must be one of
|
|
the options listed above in upper case and segmented with underscores.
|
|
The <code>NTPDC</code> variable will be tokenized and parsed like
|
|
the command line. The remaining variables are tested for existence and their
|
|
values are treated like option arguments.
|
|
</p>
|
|
|
|
<p><code>libopts</code> will search in 2 places for configuration files:
|
|
</p><ul>
|
|
<li> $HOME
|
|
</li><li> $PWD
|
|
</li></ul>
|
|
<p>The environment variables <code>HOME</code>, and <code>PWD</code>
|
|
are expanded and replaced when <samp>ntpdc</samp> runs.
|
|
For any of these that are plain files, they are simply processed.
|
|
For any that are directories, then a file named <samp>.ntprc</samp> is searched for
|
|
within that directory and processed.
|
|
</p>
|
|
<p>Configuration files may be in a wide variety of formats.
|
|
The basic format is an option name followed by a value (argument) on the
|
|
same line. Values may be separated from the option name with a colon,
|
|
equal sign or simply white space. Values may be continued across multiple
|
|
lines by escaping the newline with a backslash.
|
|
</p>
|
|
<p>Multiple programs may also share the same initialization file.
|
|
Common options are collected at the top, followed by program specific
|
|
segments. The segments are separated by lines like:
|
|
</p><div class="example">
|
|
<pre class="example">[NTPDC]
|
|
</pre></div>
|
|
<p>or by
|
|
</p><div class="example">
|
|
<pre class="example"><?program ntpdc>
|
|
</pre></div>
|
|
<p>Do not mix these styles within one configuration file.
|
|
</p>
|
|
<p>Compound values and carefully constructed string values may also be
|
|
specified using XML syntax:
|
|
</p><div class="example">
|
|
<pre class="example"><option-name>
|
|
<sub-opt>...&lt;...&gt;...</sub-opt>
|
|
</option-name>
|
|
</pre></div>
|
|
<p>yielding an <code>option-name.sub-opt</code> string value of
|
|
</p><div class="example">
|
|
<pre class="example">"...<...>..."
|
|
</pre></div>
|
|
<p><code>AutoOpts</code> does not track suboptions. You simply note that it is a
|
|
hierarchicly valued option. <code>AutoOpts</code> does provide a means for searching
|
|
the associated name/value pair list (see: optionFindValue).
|
|
</p>
|
|
<p>The command line options relating to configuration and/or usage help are:
|
|
</p>
|
|
<a name="version-_0028_002d_0029"></a>
|
|
<h4 class="subsubheading">version (-)</h4>
|
|
|
|
<p>Print the program version to standard out, optionally with licensing
|
|
information, then exit 0. The optional argument specifies how much licensing
|
|
detail to provide. The default is to print just the version. The licensing infomation may be selected with an option argument.
|
|
Only the first letter of the argument is examined:
|
|
</p>
|
|
<dl compact="compact">
|
|
<dt>‘<samp>version</samp>’</dt>
|
|
<dd><p>Only print the version. This is the default.
|
|
</p></dd>
|
|
<dt>‘<samp>copyright</samp>’</dt>
|
|
<dd><p>Name the copyright usage licensing terms.
|
|
</p></dd>
|
|
<dt>‘<samp>verbose</samp>’</dt>
|
|
<dd><p>Print the full copyright usage licensing terms.
|
|
</p></dd>
|
|
</dl>
|
|
|
|
<hr>
|
|
<a name="ntpdc-exit-status"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-Usage" accesskey="n" rel="next">ntpdc Usage</a>, Previous: <a href="#ntpdc-config" accesskey="p" rel="prev">ntpdc config</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="ntpdc-exit-status-1"></a>
|
|
<h4 class="subsection">1.1.11 ntpdc exit status</h4>
|
|
|
|
<p>One of the following exit values will be returned:
|
|
</p><dl compact="compact">
|
|
<dt>‘<samp>0 (EXIT_SUCCESS)</samp>’</dt>
|
|
<dd><p>Successful program execution.
|
|
</p></dd>
|
|
<dt>‘<samp>1 (EXIT_FAILURE)</samp>’</dt>
|
|
<dd><p>The operation failed or the command syntax was not valid.
|
|
</p></dd>
|
|
<dt>‘<samp>66 (EX_NOINPUT)</samp>’</dt>
|
|
<dd><p>A specified configuration file could not be loaded.
|
|
</p></dd>
|
|
<dt>‘<samp>70 (EX_SOFTWARE)</samp>’</dt>
|
|
<dd><p>libopts had an internal operational error. Please report
|
|
it to autogen-users@lists.sourceforge.net. Thank you.
|
|
</p></dd>
|
|
</dl>
|
|
<hr>
|
|
<a name="ntpdc-Usage"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-See-Also" accesskey="n" rel="next">ntpdc See Also</a>, Previous: <a href="#ntpdc-exit-status" accesskey="p" rel="prev">ntpdc exit status</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="ntpdc-Usage-1"></a>
|
|
<h4 class="subsection">1.1.12 ntpdc Usage</h4>
|
|
<hr>
|
|
<a name="ntpdc-See-Also"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-Authors" accesskey="n" rel="next">ntpdc Authors</a>, Previous: <a href="#ntpdc-Usage" accesskey="p" rel="prev">ntpdc Usage</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="ntpdc-See-Also-1"></a>
|
|
<h4 class="subsection">1.1.13 ntpdc See Also</h4>
|
|
<hr>
|
|
<a name="ntpdc-Authors"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="#ntpdc-Bugs" accesskey="n" rel="next">ntpdc Bugs</a>, Previous: <a href="#ntpdc-See-Also" accesskey="p" rel="prev">ntpdc See Also</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="ntpdc-Authors-1"></a>
|
|
<h4 class="subsection">1.1.14 ntpdc Authors</h4>
|
|
<hr>
|
|
<a name="ntpdc-Bugs"></a>
|
|
<div class="header">
|
|
<p>
|
|
Previous: <a href="#ntpdc-Authors" accesskey="p" rel="prev">ntpdc Authors</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p>
|
|
</div>
|
|
<a name="ntpdc-Bugs-1"></a>
|
|
<h4 class="subsection">1.1.15 ntpdc Bugs</h4>
|
|
|
|
<hr>
|
|
<a name="Usage"></a>
|
|
<div class="header">
|
|
<p>
|
|
Previous: <a href="#ntpdc-Invocation" accesskey="p" rel="prev">ntpdc Invocation</a>, Up: <a href="#ntpdc-Description" accesskey="u" rel="up">ntpdc Description</a> </p>
|
|
</div>
|
|
<a name="Usage-1"></a>
|
|
<h3 class="section">1.2 Usage</h3>
|
|
|
|
<p>The simplest use of this program is as an unprivileged command to
|
|
check the current time, offset, and error in the local clock.
|
|
For example:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">ntpdc ntpserver.somewhere
|
|
</pre></div>
|
|
|
|
<p>With suitable privilege, it can be run as a command or in a
|
|
<code>cron</code> job to reset the local clock from a reliable server, like
|
|
the <code>ntpdate</code> and <code>rdate</code> commands.
|
|
For example:
|
|
</p>
|
|
<div class="example">
|
|
<pre class="example">ntpdc -a ntpserver.somewhere
|
|
</pre></div>
|
|
<hr>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|