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| 1<html lang="en"> 2<head> 3<title>Sntp User's Manual</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Sntp User's Manual"> 6<meta name="generator" content="makeinfo 4.7"> 7<link title="Top" rel="top" href="#Top"> 8<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> --- 22 unchanged lines hidden (view full) --- 31<h2 class="unnumbered">Simple Network Time Protocol User Manual</h2> 32 33<p>This document describes the use of the NTP Project's <code>sntp</code> program, 34that can be used to query a Network Time Protocol (NTP) server and 35display the time offset of the system clock relative to the server 36clock. Run as root, it can correct the system clock to this offset as 37well. It can be run as an interactive command or from a cron job. 38 | 1<html lang="en"> 2<head> 3<title>Sntp User's Manual</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Sntp User's Manual"> 6<meta name="generator" content="makeinfo 4.7"> 7<link title="Top" rel="top" href="#Top"> 8<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> --- 22 unchanged lines hidden (view full) --- 31<h2 class="unnumbered">Simple Network Time Protocol User Manual</h2> 32 33<p>This document describes the use of the NTP Project's <code>sntp</code> program, 34that can be used to query a Network Time Protocol (NTP) server and 35display the time offset of the system clock relative to the server 36clock. Run as root, it can correct the system clock to this offset as 37well. It can be run as an interactive command or from a cron job. 38 |
| 39 <p>This document applies to version 4.2.8p10 of <code>sntp</code>. | 39 <p>This document applies to version 4.2.8p11 of <code>sntp</code>. |
| 40 41 <p>The program implements the SNTP protocol as defined by RFC 5905, the NTPv4 42IETF specification. 43 44 <div class="shortcontents"> 45<h2>Short Contents</h2> 46<ul> 47<a href="#Top">Simple Network Time Protocol User Manual</a> --- 123 unchanged lines hidden (view full) --- 171 <p>The text printed is the same whether selected with the <code>help</code> option 172(<span class="option">--help</span>) or the <code>more-help</code> option (<span class="option">--more-help</span>). <code>more-help</code> will print 173the usage text by passing it through a pager program. 174<code>more-help</code> is disabled on platforms without a working 175<code>fork(2)</code> function. The <code>PAGER</code> environment variable is 176used to select the program, defaulting to <span class="file">more</span>. Both will exit 177with a status code of 0. 178 | 40 41 <p>The program implements the SNTP protocol as defined by RFC 5905, the NTPv4 42IETF specification. 43 44 <div class="shortcontents"> 45<h2>Short Contents</h2> 46<ul> 47<a href="#Top">Simple Network Time Protocol User Manual</a> --- 123 unchanged lines hidden (view full) --- 171 <p>The text printed is the same whether selected with the <code>help</code> option 172(<span class="option">--help</span>) or the <code>more-help</code> option (<span class="option">--more-help</span>). <code>more-help</code> will print 173the usage text by passing it through a pager program. 174<code>more-help</code> is disabled on platforms without a working 175<code>fork(2)</code> function. The <code>PAGER</code> environment variable is 176used to select the program, defaulting to <span class="file">more</span>. Both will exit 177with a status code of 0. 178 |
| 179<pre class="example">sntp - standard Simple Network Time Protocol client program - Ver. 4.2.8p10 180Usage: sntp [ -<flag> [<val>] | --<name>[{=| }<val>] ]... \ | 179<pre class="example">sntp - standard Simple Network Time Protocol client program - Ver. 4.2.7p245 180USAGE: sntp [ -<flag> [<val>] | --<name>[{=| }<val>] ]... \ |
| 181 [ hostname-or-IP ...] 182 Flg Arg Option-Name Description 183 -4 no ipv4 Force IPv4 DNS name resolution | 181 [ hostname-or-IP ...] 182 Flg Arg Option-Name Description 183 -4 no ipv4 Force IPv4 DNS name resolution |
| 184 - prohibits the option 'ipv6' | 184 - prohibits these options: 185 ipv6 |
| 185 -6 no ipv6 Force IPv6 DNS name resolution | 186 -6 no ipv6 Force IPv6 DNS name resolution |
| 186 - prohibits the option 'ipv4' 187 -a Num authentication Enable authentication with the key auth-keynumber | 187 - prohibits these options: 188 ipv4 189 -a Num authentication Enable authentication with the key @var{auth-keynumber} 190 -B Num bctimeout The number of seconds to wait for broadcasts |
| 188 -b Str broadcast Listen to the address specified for broadcast time sync 189 - may appear multiple times 190 -c Str concurrent Concurrently query all IPs returned for host-name 191 - may appear multiple times 192 -d no debug-level Increase debug verbosity level 193 - may appear multiple times | 191 -b Str broadcast Listen to the address specified for broadcast time sync 192 - may appear multiple times 193 -c Str concurrent Concurrently query all IPs returned for host-name 194 - may appear multiple times 195 -d no debug-level Increase debug verbosity level 196 - may appear multiple times |
| 194 -D Num set-debug-level Set the debug verbosity level | 197 -D Str set-debug-level Set the debug verbosity level |
| 195 - may appear multiple times 196 -g Num gap The gap (in milliseconds) between time requests 197 -K Fil kod KoD history filename | 198 - may appear multiple times 199 -g Num gap The gap (in milliseconds) between time requests 200 -K Fil kod KoD history filename |
| 198 -k Fil keyfile Look in this file for the key specified with -a | 201 -k Fil keyfile Look in this file for the key specified with @option{-a} |
| 199 -l Fil logfile Log to specified logfile | 202 -l Fil logfile Log to specified logfile |
| 200 -M Num steplimit Adjustments less than steplimit msec will be slewed 201 - it must be in the range: | 203 -M Num steplimit Adjustments less than @var{steplimit} msec will be slewed 204 - It must be in the range: |
| 202 greater than or equal to 0 | 205 greater than or equal to 0 |
| 203 -o Num ntpversion Send int as our NTP protocol version 204 - it must be in the range: | 206 -o Num ntpversion Send @var{int} as our NTP version 207 - It must be in the range: |
| 205 0 to 7 206 -r no usereservedport Use the NTP Reserved Port (port 123) | 208 0 to 7 209 -r no usereservedport Use the NTP Reserved Port (port 123) |
| 207 -S no step OK to 'step' the time with settimeofday(2) 208 -s no slew OK to 'slew' the time with adjtime(2) 209 -t Num timeout The number of seconds to wait for responses | 210 -S no step OK to 'step' the time with @command{settimeofday(2)} 211 -s no slew OK to 'slew' the time with @command{adjtime(2)} 212 -u Num uctimeout The number of seconds to wait for unicast responses |
| 210 no wait Wait for pending replies (if not setting the time) | 213 no wait Wait for pending replies (if not setting the time) |
| 211 - disabled as '--no-wait' | 214 - disabled as --no-wait |
| 212 - enabled by default | 215 - enabled by default |
| 213 opt version output version information and exit 214 -? no help display extended usage information and exit 215 -! no more-help extended usage information passed thru pager 216 -> opt save-opts save the option state to a config file 217 -< Str load-opts load options from a config file 218 - disabled as '--no-load-opts' | 216 opt version Output version information and exit 217 -? no help Display extended usage information and exit 218 -! no more-help Extended usage information passed thru pager 219 -> opt save-opts Save the option state to a config file 220 -< Str load-opts Load options from a config file 221 - disabled as --no-load-opts |
| 219 - may appear multiple times 220 221Options are specified by doubled hyphens and their name or by a single 222hyphen and the flag character. 223 224 | 222 - may appear multiple times 223 224Options are specified by doubled hyphens and their name or by a single 225hyphen and the flag character. 226 227 |
| 228 |
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| 225The following option preset mechanisms are supported: 226 - reading file $HOME/.ntprc 227 - reading file ./.ntprc 228 - examining environment variables named SNTP_* 229 | 229The following option preset mechanisms are supported: 230 - reading file $HOME/.ntprc 231 - reading file ./.ntprc 232 - examining environment variables named SNTP_* 233 |
| 230Please send bug reports to: <http://bugs.ntp.org, bugs@ntp.org> | 234please send bug reports to: http://bugs.ntp.org, bugs@ntp.org |
| 231</pre> 232 <div class="node"> 233<p><hr> 234<a name="sntp-ipv4"></a>Next: <a rel="next" accesskey="n" href="#sntp-ipv6">sntp ipv6</a>, 235Previous: <a rel="previous" accesskey="p" href="#sntp-usage">sntp usage</a>, 236Up: <a rel="up" accesskey="u" href="#sntp-Invocation">sntp Invocation</a> 237<br> 238</div> --- 386 unchanged lines hidden --- | 235</pre> 236 <div class="node"> 237<p><hr> 238<a name="sntp-ipv4"></a>Next: <a rel="next" accesskey="n" href="#sntp-ipv6">sntp ipv6</a>, 239Previous: <a rel="previous" accesskey="p" href="#sntp-usage">sntp usage</a>, 240Up: <a rel="up" accesskey="u" href="#sntp-Invocation">sntp Invocation</a> 241<br> 242</div> --- 386 unchanged lines hidden --- |