1<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 2<html> 3<!-- Created by GNU Texinfo 6.6, http://www.gnu.org/software/texinfo/ --> 4<head> 5<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 6<title>ntpdc: NTPD Control User’s Manual</title> 7 8<meta name="description" content="ntpdc: NTPD Control User’s Manual"> 9<meta name="keywords" content="ntpdc: NTPD Control User’s Manual"> 10<meta name="resource-type" content="document"> 11<meta name="distribution" content="global"> 12<meta name="Generator" content="makeinfo"> 13<link href="#Top" rel="start" title="Top"> 14<link href="dir.html#Top" rel="up" title="(dir)"> 15<style type="text/css"> 16<!-- 17a.summary-letter {text-decoration: none} 18blockquote.indentedblock {margin-right: 0em} 19div.display {margin-left: 3.2em} 20div.example {margin-left: 3.2em} 21div.lisp {margin-left: 3.2em} 22kbd {font-style: oblique} 23pre.display {font-family: inherit} 24pre.format {font-family: inherit} 25pre.menu-comment {font-family: serif} 26pre.menu-preformatted {font-family: serif} 27span.nolinebreak {white-space: nowrap} 28span.roman {font-family: initial; font-weight: normal} 29span.sansserif {font-family: sans-serif; font-weight: normal} 30ul.no-bullet {list-style: none} 31--> 32</style> 33 34 35</head> 36 37<body lang="en"> 38<h1 class="settitle" align="center">ntpdc: NTPD Control User’s Manual</h1> 39 40 41 42 43 44<span id="Top"></span><div class="header"> 45<p> 46Next: <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> 47</div> 48<span id="ntpdc_003a-NTPD-Control-User-Manual"></span><h1 class="top">ntpdc: NTPD Control User Manual</h1> 49 50<p>This document describes the use of the NTP Project’s <code>ntpdc</code> program, 51that can be used to query a Network Time Protocol (NTP) server and 52display the time offset of the system clock relative to the server 53clock. Run as root, it can correct the system clock to this offset as 54well. It can be run as an interactive command or from a cron job. 55</p> 56<p>This document applies to version 4.2.8p17 of <code>ntpdc</code>. 57</p> 58<p>The program implements the SNTP protocol as defined by RFC 5905, the NTPv4 59IETF specification. 60</p> 61<span id="SEC_Overview"></span> 62<h2 class="shortcontents-heading">Short Table of Contents</h2> 63 64<div class="shortcontents"> 65<ul class="no-bullet"> 66<li><a id="stoc-Description" href="#toc-Description">1 Description</a></li> 67</ul> 68</div> 69 70 71<table class="menu" border="0" cellspacing="0"> 72<tr><td align="left" valign="top">• <a href="#ntpdc-Description" accesskey="1">ntpdc Description</a></td><td> </td><td align="left" valign="top">Description 73</td></tr> 74<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 75</td></tr> 76<tr><td align="left" valign="top">• <a href="#Usage" accesskey="3">Usage</a></td><td> </td><td align="left" valign="top">Usage 77</td></tr> 78</table> 79 80<hr> 81<span id="ntpdc-Description"></span><div class="header"> 82<p> 83Next: <a href="#ntpdc-Invocation" accesskey="n" rel="next">ntpdc Invocation</a>, Up: <a href="#Top" accesskey="u" rel="up">Top</a> </p> 84</div> 85<span id="Description"></span><h2 class="chapter">1 Description</h2> 86 87<p>By default, <code>ntpdc</code> writes the local data and time (i.e., not UTC) to the 88standard output in the format: 89</p> 90<div class="example"> 91<pre class="example">1996-10-15 20:17:25.123 (+0800) +4.567 +/- 0.089 secs 92</pre></div> 93 94<p>where 95YYYY-MM-DD HH:MM:SS.SUBSEC is the local date and time, 96(+0800) is the local timezone adjustment (so we would add 8 hours and 0 minutes to convert the reported local time to UTC), 97and 98the +4.567 +/- 0.089 secs indicates the time offset and 99error bound of the system clock relative to the server clock. 100</p> 101<table class="menu" border="0" cellspacing="0"> 102<tr><td align="left" valign="top">• <a href="#ntpdc-Invocation" accesskey="1">Invoking ntpdc</a></td><td> </td><td align="left" valign="top"> 103</td></tr> 104<tr><td align="left" valign="top">• <a href="#Usage" accesskey="2">Usage</a></td><td> </td><td align="left" valign="top"> 105</td></tr> 106</table> 107 108<hr> 109<span id="ntpdc-Invocation"></span><div class="header"> 110<p> 111Next: <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> 112</div> 113<span id="Invoking-ntpdc"></span><h3 class="section">1.1 Invoking ntpdc</h3> 114<span id="index-ntpdc"></span> 115<span id="index-vendor_002dspecific-NTPD-control-program"></span> 116 117 118 119<p><code>ntpdc</code> 120is deprecated. 121Please use 122<code>ntpq(1ntpqmdoc)</code> instead - it can do everything 123<code>ntpdc</code> 124used to do, and it does so using a much more sane interface. 125</p> 126<p><code>ntpdc</code> 127is a utility program used to query 128<code>ntpd(1ntpdmdoc)</code> 129about its 130current state and to request changes in that state. 131It uses NTP mode 7 control message formats described in the source code. 132The program may 133be run either in interactive mode or controlled using command line 134arguments. 135Extensive state and statistics information is available 136through the 137<code>ntpdc</code> 138interface. 139In addition, nearly all the 140configuration options which can be specified at startup using 141ntpd’s configuration file may also be specified at run time using 142<code>ntpdc</code> 143</p> 144<p>This section was generated by <strong>AutoGen</strong>, 145using the <code>agtexi-cmd</code> template and the option descriptions for the <code>ntpdc</code> program. 146This software is released under the NTP license, <http://ntp.org/license>. 147</p> 148<table class="menu" border="0" cellspacing="0"> 149<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>) 150</td></tr> 151<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) 152</td></tr> 153<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) 154</td></tr> 155<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) 156</td></tr> 157<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) 158</td></tr> 159<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) 160</td></tr> 161<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) 162</td></tr> 163<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) 164</td></tr> 165<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) 166</td></tr> 167<tr><td align="left" valign="top">• <a href="#ntpdc-unconnected">ntpdc unconnected</a></td><td> </td><td align="left" valign="top">unconnected option (-u) 168</td></tr> 169<tr><td align="left" valign="top">• <a href="#ntpdc-config">ntpdc config</a></td><td> </td><td align="left" valign="top">presetting/configuring ntpdc 170</td></tr> 171<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 172</td></tr> 173<tr><td align="left" valign="top">• <a href="#ntpdc-Usage">ntpdc Usage</a></td><td> </td><td align="left" valign="top">Usage 174</td></tr> 175<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 176</td></tr> 177<tr><td align="left" valign="top">• <a href="#ntpdc-Authors">ntpdc Authors</a></td><td> </td><td align="left" valign="top">Authors 178</td></tr> 179<tr><td align="left" valign="top">• <a href="#ntpdc-Bugs">ntpdc Bugs</a></td><td> </td><td align="left" valign="top">Bugs 180</td></tr> 181</table> 182 183<hr> 184<span id="ntpdc-usage"></span><div class="header"> 185<p> 186Next: <a href="#ntpdc-ipv4" accesskey="n" rel="next">ntpdc ipv4</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p> 187</div> 188<span id="ntpdc-help_002fusage-_0028_002d_002dhelp_0029"></span><h4 class="subsection">1.1.1 ntpdc help/usage (<samp>--help</samp>)</h4> 189<span id="index-ntpdc-help"></span> 190 191<p>This is the automatically generated usage text for ntpdc. 192</p> 193<p>The text printed is the same whether selected with the <code>help</code> option 194(<samp>--help</samp>) or the <code>more-help</code> option (<samp>--more-help</samp>). <code>more-help</code> will print 195the usage text by passing it through a pager program. 196<code>more-help</code> is disabled on platforms without a working 197<code>fork(2)</code> function. The <code>PAGER</code> environment variable is 198used to select the program, defaulting to <samp>more</samp>. Both will exit 199with a status code of 0. 200</p> 201<div class="example"> 202<pre class="example">ntpdc - vendor-specific NTPD control program - Ver. 4.2.8p17 203Usage: ntpdc [ -<flag> [<val>] | --<name>[{=| }<val>] ]... [ host ...] 204 Flg Arg Option-Name Description 205 -4 no ipv4 Force IPv4 DNS name resolution 206 - prohibits the option 'ipv6' 207 -6 no ipv6 Force IPv6 DNS name resolution 208 - prohibits the option 'ipv4' 209 -c Str command run a command and exit 210 - may appear multiple times 211 -d no debug-level Increase debug verbosity level 212 - may appear multiple times 213 -D Num set-debug-level Set the debug verbosity level 214 - may appear multiple times 215 -i no interactive Force ntpq to operate in interactive mode 216 - prohibits these options: 217 command 218 listpeers 219 peers 220 showpeers 221 -l no listpeers Print a list of the peers 222 - prohibits the option 'command' 223 -n no numeric numeric host addresses 224 -p no peers Print a list of the peers 225 - prohibits the option 'command' 226 -s no showpeers Show a list of the peers 227 - prohibits the option 'command' 228 -u no unconnected Use unconnected UDP to communicate with ntpd (default on Windows) 229 opt version output version information and exit 230 -? no help display extended usage information and exit 231 -! no more-help extended usage information passed thru pager 232 -> opt save-opts save the option state to a config file 233 -< Str load-opts load options from a config file 234 - disabled as '--no-load-opts' 235 - may appear multiple times 236 237Options are specified by doubled hyphens and their name or by a single 238hyphen and the flag character. 239 240 241The following option preset mechanisms are supported: 242 - reading file $HOME/.ntprc 243 - reading file ./.ntprc 244 - examining environment variables named NTPDC_* 245 246Please send bug reports to: <https://bugs.ntp.org, bugs@ntp.org> 247</pre></div> 248 249<hr> 250<span id="ntpdc-ipv4"></span><div class="header"> 251<p> 252Next: <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> 253</div> 254<span id="ipv4-option-_0028_002d4_0029"></span><h4 class="subsection">1.1.2 ipv4 option (-4)</h4> 255<span id="index-ntpdc_002dipv4"></span> 256 257<p>This is the “force ipv4 dns name resolution” option. 258</p> 259<p>This option has some usage constraints. It: 260</p><ul> 261<li> must not appear in combination with any of the following options: 262ipv6. 263</li></ul> 264 265<p>Force DNS resolution of following host names on the command line 266to the IPv4 namespace. 267</p><hr> 268<span id="ntpdc-ipv6"></span><div class="header"> 269<p> 270Next: <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> 271</div> 272<span id="ipv6-option-_0028_002d6_0029"></span><h4 class="subsection">1.1.3 ipv6 option (-6)</h4> 273<span id="index-ntpdc_002dipv6"></span> 274 275<p>This is the “force ipv6 dns name resolution” option. 276</p> 277<p>This option has some usage constraints. It: 278</p><ul> 279<li> must not appear in combination with any of the following options: 280ipv4. 281</li></ul> 282 283<p>Force DNS resolution of following host names on the command line 284to the IPv6 namespace. 285</p><hr> 286<span id="ntpdc-command"></span><div class="header"> 287<p> 288Next: <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> 289</div> 290<span id="command-option-_0028_002dc_0029"></span><h4 class="subsection">1.1.4 command option (-c)</h4> 291<span id="index-ntpdc_002dcommand"></span> 292 293<p>This is the “run a command and exit” option. 294This option takes a string argument <samp>cmd</samp>. 295</p> 296<p>This option has some usage constraints. It: 297</p><ul> 298<li> may appear an unlimited number of times. 299</li></ul> 300 301<p>The following argument is interpreted as an interactive format command 302and is added to the list of commands to be executed on the specified 303host(s). 304</p><hr> 305<span id="ntpdc-interactive"></span><div class="header"> 306<p> 307Next: <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> 308</div> 309<span id="interactive-option-_0028_002di_0029"></span><h4 class="subsection">1.1.5 interactive option (-i)</h4> 310<span id="index-ntpdc_002dinteractive"></span> 311 312<p>This is the “force ntpq to operate in interactive mode” option. 313</p> 314<p>This option has some usage constraints. It: 315</p><ul> 316<li> must not appear in combination with any of the following options: 317command, listpeers, peers, showpeers. 318</li></ul> 319 320<p>Force ntpq to operate in interactive mode. Prompts will be written 321to the standard output and commands read from the standard input. 322</p><hr> 323<span id="ntpdc-listpeers"></span><div class="header"> 324<p> 325Next: <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> 326</div> 327<span id="listpeers-option-_0028_002dl_0029"></span><h4 class="subsection">1.1.6 listpeers option (-l)</h4> 328<span id="index-ntpdc_002dlistpeers"></span> 329 330<p>This is the “print a list of the peers” option. 331</p> 332<p>This option has some usage constraints. It: 333</p><ul> 334<li> must not appear in combination with any of the following options: 335command. 336</li></ul> 337 338<p>Print a list of the peers known to the server as well as a summary of 339their state. This is equivalent to the ’listpeers’ interactive command. 340</p><hr> 341<span id="ntpdc-numeric"></span><div class="header"> 342<p> 343Next: <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> 344</div> 345<span id="numeric-option-_0028_002dn_0029"></span><h4 class="subsection">1.1.7 numeric option (-n)</h4> 346<span id="index-ntpdc_002dnumeric"></span> 347 348<p>This is the “numeric host addresses” option. 349Output all host addresses in dotted-quad numeric format rather than 350converting to the canonical host names. 351</p><hr> 352<span id="ntpdc-peers"></span><div class="header"> 353<p> 354Next: <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> 355</div> 356<span id="peers-option-_0028_002dp_0029"></span><h4 class="subsection">1.1.8 peers option (-p)</h4> 357<span id="index-ntpdc_002dpeers"></span> 358 359<p>This is the “print a list of the peers” option. 360</p> 361<p>This option has some usage constraints. It: 362</p><ul> 363<li> must not appear in combination with any of the following options: 364command. 365</li></ul> 366 367<p>Print a list of the peers known to the server as well as a summary 368of their state. This is equivalent to the ’peers’ interactive command. 369</p><hr> 370<span id="ntpdc-showpeers"></span><div class="header"> 371<p> 372Next: <a href="#ntpdc-unconnected" accesskey="n" rel="next">ntpdc unconnected</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> 373</div> 374<span id="showpeers-option-_0028_002ds_0029"></span><h4 class="subsection">1.1.9 showpeers option (-s)</h4> 375<span id="index-ntpdc_002dshowpeers"></span> 376 377<p>This is the “show a list of the peers” option. 378</p> 379<p>This option has some usage constraints. It: 380</p><ul> 381<li> must not appear in combination with any of the following options: 382command. 383</li></ul> 384 385<p>Print a list of the peers known to the server as well as a summary 386of their state. This is equivalent to the ’dmpeers’ interactive command. 387</p><hr> 388<span id="ntpdc-unconnected"></span><div class="header"> 389<p> 390Next: <a href="#ntpdc-config" accesskey="n" rel="next">ntpdc config</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> 391</div> 392<span id="unconnected-option-_0028_002du_0029"></span><h4 class="subsection">1.1.10 unconnected option (-u)</h4> 393<span id="index-ntpdc_002dunconnected"></span> 394 395<p>This is the “use unconnected udp to communicate with ntpd (default on windows)” option. 396Open an unconnected UDP association to ntpd (the default 397on Windows). 398</p> 399 400<hr> 401<span id="ntpdc-config"></span><div class="header"> 402<p> 403Next: <a href="#ntpdc-exit-status" accesskey="n" rel="next">ntpdc exit status</a>, Previous: <a href="#ntpdc-unconnected" accesskey="p" rel="prev">ntpdc unconnected</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p> 404</div> 405<span id="presetting_002fconfiguring-ntpdc"></span><h4 class="subsection">1.1.11 presetting/configuring ntpdc</h4> 406 407<p>Any option that is not marked as <i>not presettable</i> may be preset by 408loading 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 409the options listed above in upper case and segmented with underscores. 410The <code>NTPDC</code> variable will be tokenized and parsed like 411the command line. The remaining variables are tested for existence and their 412values are treated like option arguments. 413</p> 414 415<p><code>libopts</code> will search in 2 places for configuration files: 416</p><ul> 417<li> $HOME 418</li><li> $PWD 419</li></ul> 420<p>The environment variables <code>HOME</code>, and <code>PWD</code> 421are expanded and replaced when <samp>ntpdc</samp> runs. 422For any of these that are plain files, they are simply processed. 423For any that are directories, then a file named <samp>.ntprc</samp> is searched for 424within that directory and processed. 425</p> 426<p>Configuration files may be in a wide variety of formats. 427The basic format is an option name followed by a value (argument) on the 428same line. Values may be separated from the option name with a colon, 429equal sign or simply white space. Values may be continued across multiple 430lines by escaping the newline with a backslash. 431</p> 432<p>Multiple programs may also share the same initialization file. 433Common options are collected at the top, followed by program specific 434segments. The segments are separated by lines like: 435</p><div class="example"> 436<pre class="example">[NTPDC] 437</pre></div> 438<p>or by 439</p><div class="example"> 440<pre class="example"><?program ntpdc> 441</pre></div> 442<p>Do not mix these styles within one configuration file. 443</p> 444<p>Compound values and carefully constructed string values may also be 445specified using XML syntax: 446</p><div class="example"> 447<pre class="example"><option-name> 448 <sub-opt>...&lt;...&gt;...</sub-opt> 449</option-name> 450</pre></div> 451<p>yielding an <code>option-name.sub-opt</code> string value of 452</p><div class="example"> 453<pre class="example">"...<...>..." 454</pre></div> 455<p><code>AutoOpts</code> does not track suboptions. You simply note that it is a 456hierarchicly valued option. <code>AutoOpts</code> does provide a means for searching 457the associated name/value pair list (see: optionFindValue). 458</p> 459<p>The command line options relating to configuration and/or usage help are: 460</p> 461<span id="version-_0028_002d_0029"></span><h4 class="subsubheading">version (-)</h4> 462 463<p>Print the program version to standard out, optionally with licensing 464information, then exit 0. The optional argument specifies how much licensing 465detail to provide. The default is to print just the version. The licensing information may be selected with an option argument. 466Only the first letter of the argument is examined: 467</p> 468<dl compact="compact"> 469<dt>‘<samp>version</samp>’</dt> 470<dd><p>Only print the version. This is the default. 471</p></dd> 472<dt>‘<samp>copyright</samp>’</dt> 473<dd><p>Name the copyright usage licensing terms. 474</p></dd> 475<dt>‘<samp>verbose</samp>’</dt> 476<dd><p>Print the full copyright usage licensing terms. 477</p></dd> 478</dl> 479 480<hr> 481<span id="ntpdc-exit-status"></span><div class="header"> 482<p> 483Next: <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> 484</div> 485<span id="ntpdc-exit-status-1"></span><h4 class="subsection">1.1.12 ntpdc exit status</h4> 486 487<p>One of the following exit values will be returned: 488</p><dl compact="compact"> 489<dt>‘<samp>0 (EXIT_SUCCESS)</samp>’</dt> 490<dd><p>Successful program execution. 491</p></dd> 492<dt>‘<samp>1 (EXIT_FAILURE)</samp>’</dt> 493<dd><p>The operation failed or the command syntax was not valid. 494</p></dd> 495<dt>‘<samp>66 (EX_NOINPUT)</samp>’</dt> 496<dd><p>A specified configuration file could not be loaded. 497</p></dd> 498<dt>‘<samp>70 (EX_SOFTWARE)</samp>’</dt> 499<dd><p>libopts had an internal operational error. Please report 500it to autogen-users@lists.sourceforge.net. Thank you. 501</p></dd> 502</dl> 503<hr> 504<span id="ntpdc-Usage"></span><div class="header"> 505<p> 506Next: <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> 507</div> 508<span id="ntpdc-Usage-1"></span><h4 class="subsection">1.1.13 ntpdc Usage</h4> 509<hr> 510<span id="ntpdc-See-Also"></span><div class="header"> 511<p> 512Next: <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> 513</div> 514<span id="ntpdc-See-Also-1"></span><h4 class="subsection">1.1.14 ntpdc See Also</h4> 515<hr> 516<span id="ntpdc-Authors"></span><div class="header"> 517<p> 518Next: <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> 519</div> 520<span id="ntpdc-Authors-1"></span><h4 class="subsection">1.1.15 ntpdc Authors</h4> 521<hr> 522<span id="ntpdc-Bugs"></span><div class="header"> 523<p> 524Previous: <a href="#ntpdc-Authors" accesskey="p" rel="prev">ntpdc Authors</a>, Up: <a href="#ntpdc-Invocation" accesskey="u" rel="up">ntpdc Invocation</a> </p> 525</div> 526<span id="ntpdc-Bugs-1"></span><h4 class="subsection">1.1.16 ntpdc Bugs</h4> 527 528<hr> 529<span id="Usage"></span><div class="header"> 530<p> 531Previous: <a href="#ntpdc-Invocation" accesskey="p" rel="prev">ntpdc Invocation</a>, Up: <a href="#ntpdc-Description" accesskey="u" rel="up">ntpdc Description</a> </p> 532</div> 533<span id="Usage-1"></span><h3 class="section">1.2 Usage</h3> 534 535<p>The simplest use of this program is as an unprivileged command to 536check the current time, offset, and error in the local clock. 537For example: 538</p> 539<div class="example"> 540<pre class="example">ntpdc ntpserver.somewhere 541</pre></div> 542 543<p>With suitable privilege, it can be run as a command or in a 544<code>cron</code> job to reset the local clock from a reliable server, like 545the <code>ntpdate</code> and <code>rdate</code> commands. 546For example: 547</p> 548<div class="example"> 549<pre class="example">ntpdc -a ntpserver.somewhere 550</pre></div> 551<hr> 552 553 554 555</body> 556</html> 557