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516 lines
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<title>ntpdc: NTPD Control User's Manual</title>
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<h1 class="settitle">ntpdc: NTPD Control User's Manual</h1>
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<div class="node">
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<p><hr>
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<a name="Top"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-Description">ntpdc Description</a>,
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Previous: <a rel="previous" accesskey="p" href="#dir">(dir)</a>,
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Up: <a rel="up" accesskey="u" href="#dir">(dir)</a>
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<br>
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</div>
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<h2 class="unnumbered">ntpdc: NTPD Control User Manual</h2>
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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>This document applies to version 4.2.8p10 of <code>ntpdc</code>.
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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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<div class="shortcontents">
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<h2>Short Contents</h2>
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<ul>
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<a href="#Top">ntpdc: NTPD Control User Manual</a>
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</ul>
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</div>
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<ul class="menu">
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<li><a accesskey="1" href="#ntpdc-Description">ntpdc Description</a>: Description
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<li><a accesskey="2" href="#ntpdc-Invocation">ntpdc Invocation</a>: Invoking ntpdc
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<li><a accesskey="3" href="#Usage">Usage</a>: Usage
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</ul>
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<div class="node">
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<p><hr>
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<a name="ntpdc-Description"></a>
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<br>
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</div>
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<!-- node-name, next, previous, up -->
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<h3 class="section">Description</h3>
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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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<pre class="example"> 1996-10-15 20:17:25.123 (+0800) +4.567 +/- 0.089 secs
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</pre>
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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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<div class="node">
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<p><hr>
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<a name="ntpdc-Invocation"></a>
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<br>
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</div>
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<h3 class="section">Invoking ntpdc</h3>
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<p><a name="index-ntpdc-1"></a><a name="index-vendor_002dspecific-NTPD-control-program-2"></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><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>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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<ul class="menu">
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<li><a accesskey="1" href="#ntpdc-usage">ntpdc usage</a>: ntpdc help/usage (<span class="option">--help</span>)
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<li><a accesskey="2" href="#ntpdc-ipv4">ntpdc ipv4</a>: ipv4 option (-4)
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<li><a accesskey="3" href="#ntpdc-ipv6">ntpdc ipv6</a>: ipv6 option (-6)
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<li><a accesskey="4" href="#ntpdc-command">ntpdc command</a>: command option (-c)
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<li><a accesskey="5" href="#ntpdc-interactive">ntpdc interactive</a>: interactive option (-i)
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<li><a accesskey="6" href="#ntpdc-listpeers">ntpdc listpeers</a>: listpeers option (-l)
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<li><a accesskey="7" href="#ntpdc-numeric">ntpdc numeric</a>: numeric option (-n)
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<li><a accesskey="8" href="#ntpdc-peers">ntpdc peers</a>: peers option (-p)
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<li><a accesskey="9" href="#ntpdc-showpeers">ntpdc showpeers</a>: showpeers option (-s)
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<li><a href="#ntpdc-config">ntpdc config</a>: presetting/configuring ntpdc
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<li><a href="#ntpdc-exit-status">ntpdc exit status</a>: exit status
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<li><a href="#ntpdc-Usage">ntpdc Usage</a>: Usage
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<li><a href="#ntpdc-See-Also">ntpdc See Also</a>: See Also
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<li><a href="#ntpdc-Authors">ntpdc Authors</a>: Authors
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<li><a href="#ntpdc-Bugs">ntpdc Bugs</a>: Bugs
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</ul>
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<div class="node">
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<p><hr>
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<a name="ntpdc-usage"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-ipv4">ntpdc ipv4</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">ntpdc help/usage (<span class="option">--help</span>)</h4>
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<p><a name="index-ntpdc-help-3"></a>
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This is the automatically generated usage text for ntpdc.
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<p>The text printed is the same whether selected with the <code>help</code> option
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(<span class="option">--help</span>) or the <code>more-help</code> option (<span class="option">--more-help</span>). <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 <span class="file">more</span>. Both will exit
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with a status code of 0.
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<pre class="example">ntpdc - vendor-specific NTPD control program - Ver. 4.2.8p10-beta
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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>
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<div class="node">
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<p><hr>
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<a name="ntpdc-ipv4"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-ipv6">ntpdc ipv6</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-usage">ntpdc usage</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">ipv4 option (-4)</h4>
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<p><a name="index-ntpdc_002dipv4-4"></a>
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This is the “force ipv4 dns name resolution” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</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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<div class="node">
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<p><hr>
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<a name="ntpdc-ipv6"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-command">ntpdc command</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-ipv4">ntpdc ipv4</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">ipv6 option (-6)</h4>
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<p><a name="index-ntpdc_002dipv6-5"></a>
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This is the “force ipv6 dns name resolution” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</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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<div class="node">
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<p><hr>
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<a name="ntpdc-command"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-interactive">ntpdc interactive</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-ipv6">ntpdc ipv6</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">command option (-c)</h4>
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<p><a name="index-ntpdc_002dcommand-6"></a>
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This is the “run a command and exit” option.
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This option takes a string argument <span class="file">cmd</span>.
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<p class="noindent">This option has some usage constraints. It:
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<ul>
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<li>may appear an unlimited number of times.
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</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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<div class="node">
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<p><hr>
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<a name="ntpdc-interactive"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-listpeers">ntpdc listpeers</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-command">ntpdc command</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">interactive option (-i)</h4>
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<p><a name="index-ntpdc_002dinteractive-7"></a>
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This is the “force ntpq to operate in interactive mode” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</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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<div class="node">
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<p><hr>
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<a name="ntpdc-listpeers"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-numeric">ntpdc numeric</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-interactive">ntpdc interactive</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">listpeers option (-l)</h4>
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<p><a name="index-ntpdc_002dlistpeers-8"></a>
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This is the “print a list of the peers” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</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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<div class="node">
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<p><hr>
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<a name="ntpdc-numeric"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-peers">ntpdc peers</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-listpeers">ntpdc listpeers</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">numeric option (-n)</h4>
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<p><a name="index-ntpdc_002dnumeric-9"></a>
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This is the “numeric host addresses” option.
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Output all host addresses in dotted-quad numeric format rather than
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converting to the canonical host names.
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<div class="node">
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<p><hr>
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<a name="ntpdc-peers"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-showpeers">ntpdc showpeers</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-numeric">ntpdc numeric</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">peers option (-p)</h4>
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<p><a name="index-ntpdc_002dpeers-10"></a>
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This is the “print a list of the peers” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</ul>
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<p>Print a list of the peers known to the server as well as a summary
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of their state. This is equivalent to the 'peers' interactive command.
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<div class="node">
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<p><hr>
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<a name="ntpdc-showpeers"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-config">ntpdc config</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-peers">ntpdc peers</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">showpeers option (-s)</h4>
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<p><a name="index-ntpdc_002dshowpeers-11"></a>
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This is the “show a list of the peers” option.
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<p class="noindent">This option has some usage constraints. It:
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<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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</ul>
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<p>Print a list of the peers known to the server as well as a summary
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of their state. This is equivalent to the 'dmpeers' interactive command.
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<div class="node">
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<p><hr>
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<a name="ntpdc-config"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-exit-status">ntpdc exit status</a>,
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Previous: <a rel="previous" accesskey="p" href="#ntpdc-showpeers">ntpdc showpeers</a>,
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Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
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<br>
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</div>
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<h4 class="subsection">presetting/configuring ntpdc</h4>
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<p>Any option that is not marked as <i>not presettable</i> may be preset by
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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
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the options listed above in upper case and segmented with underscores.
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The <code>NTPDC</code> variable will be tokenized and parsed like
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the command line. The remaining variables are tested for existence and their
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values are treated like option arguments.
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<p class="noindent"><code>libopts</code> will search in 2 places for configuration files:
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<ul>
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<li>$HOME
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<li>$PWD
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</ul>
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The environment variables <code>HOME</code>, and <code>PWD</code>
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are expanded and replaced when <span class="file">ntpdc</span> runs.
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For any of these that are plain files, they are simply processed.
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For any that are directories, then a file named <span class="file">.ntprc</span> is searched for
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within that directory and processed.
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<p>Configuration files may be in a wide variety of formats.
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The basic format is an option name followed by a value (argument) on the
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same line. Values may be separated from the option name with a colon,
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equal sign or simply white space. Values may be continued across multiple
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lines by escaping the newline with a backslash.
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<p>Multiple programs may also share the same initialization file.
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Common options are collected at the top, followed by program specific
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segments. The segments are separated by lines like:
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<pre class="example"> [NTPDC]
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</pre>
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<p class="noindent">or by
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<pre class="example"> <?program ntpdc>
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</pre>
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<p class="noindent">Do not mix these styles within one configuration file.
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<p>Compound values and carefully constructed string values may also be
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specified using XML syntax:
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<pre class="example"> <option-name>
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<sub-opt>...&lt;...&gt;...</sub-opt>
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</option-name>
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</pre>
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<p class="noindent">yielding an <code>option-name.sub-opt</code> string value of
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<pre class="example"> "...<...>..."
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</pre>
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<p><code>AutoOpts</code> does not track suboptions. You simply note that it is a
|
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hierarchicly valued option. <code>AutoOpts</code> does provide a means for searching
|
|
the associated name/value pair list (see: optionFindValue).
|
|
|
|
<p>The command line options relating to configuration and/or usage help are:
|
|
|
|
<h5 class="subsubheading">version (-)</h5>
|
|
|
|
<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:
|
|
|
|
<dl>
|
|
<dt><span class="samp">version</span><dd>Only print the version. This is the default.
|
|
<br><dt><span class="samp">copyright</span><dd>Name the copyright usage licensing terms.
|
|
<br><dt><span class="samp">verbose</span><dd>Print the full copyright usage licensing terms.
|
|
</dl>
|
|
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="ntpdc-exit-status"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-Usage">ntpdc Usage</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="#ntpdc-config">ntpdc config</a>,
|
|
Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
|
|
<br>
|
|
</div>
|
|
|
|
<h4 class="subsection">ntpdc exit status</h4>
|
|
|
|
<p>One of the following exit values will be returned:
|
|
<dl>
|
|
<dt><span class="samp">0 (EXIT_SUCCESS)</span><dd>Successful program execution.
|
|
<br><dt><span class="samp">1 (EXIT_FAILURE)</span><dd>The operation failed or the command syntax was not valid.
|
|
<br><dt><span class="samp">66 (EX_NOINPUT)</span><dd>A specified configuration file could not be loaded.
|
|
<br><dt><span class="samp">70 (EX_SOFTWARE)</span><dd>libopts had an internal operational error. Please report
|
|
it to autogen-users@lists.sourceforge.net. Thank you.
|
|
</dl>
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="ntpdc-Usage"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-See-Also">ntpdc See Also</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="#ntpdc-exit-status">ntpdc exit status</a>,
|
|
Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
|
|
<br>
|
|
</div>
|
|
|
|
<h4 class="subsection">ntpdc Usage</h4>
|
|
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="ntpdc-See-Also"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-Authors">ntpdc Authors</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="#ntpdc-Usage">ntpdc Usage</a>,
|
|
Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
|
|
<br>
|
|
</div>
|
|
|
|
<h4 class="subsection">ntpdc See Also</h4>
|
|
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="ntpdc-Authors"></a>Next: <a rel="next" accesskey="n" href="#ntpdc-Bugs">ntpdc Bugs</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="#ntpdc-See-Also">ntpdc See Also</a>,
|
|
Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
|
|
<br>
|
|
</div>
|
|
|
|
<h4 class="subsection">ntpdc Authors</h4>
|
|
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="ntpdc-Bugs"></a>Previous: <a rel="previous" accesskey="p" href="#ntpdc-Authors">ntpdc Authors</a>,
|
|
Up: <a rel="up" accesskey="u" href="#ntpdc-Invocation">ntpdc Invocation</a>
|
|
<br>
|
|
</div>
|
|
|
|
<h4 class="subsection">ntpdc Bugs</h4>
|
|
|
|
<div class="node">
|
|
<p><hr>
|
|
<a name="Usage"></a>
|
|
<br>
|
|
</div>
|
|
|
|
<!-- node-name, next, previous, up -->
|
|
<h3 class="section">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:
|
|
|
|
<pre class="example"> ntpdc ntpserver.somewhere
|
|
</pre>
|
|
<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:
|
|
|
|
<pre class="example"> ntpdc -a ntpserver.somewhere
|
|
</pre>
|
|
</body></html>
|
|
|