sntp(1) User Commands sntp(1) (NAME) sntp - (SNTP) (SYNOPSIS) sntp [-flags] [-flag [value]] [--option-name[[=| ]value]] [ hostname- or-IP ...] (DESCRIPTION) sntp SNTP NTP SNTP ( ) . cron . NTP ( ) SNTP ( ) RFC 5905 . ( UTC) : '1996-10-15 20:17:25.123 (+0800) +4.567 +/- 0.089 [host] IP sN' '(+0800)' UTC '+4.567' . ( . ). . '+/- 0.089' (synchronization distance) . '+/- ?' . host IP . IP . stratum . (OPTIONS) -4, --ipv4 (DNS) IPv4. : ipv6. IPv4 . -6, --ipv6 (DNS) IPv6. : ipv4. IPv6 . -a auth-keynumber, --authentication=auth-keynumber auth-keynumber. . . keyid keyfile . keyfile (-k) . -b broadcast-address, --broadcast=broadcast-address (broadcast). . sntp NTP . ( ) -t . -c host-name, --concurrent=host-name IP host- name. . <<>> NTP <<>> . IP DNS ntpd sntp IP . -c --concurrent IP DNS . -d, --debug-level (debug). . -D number, --set-debug-level=number . . . -g milliseconds, --gap=milliseconds ( ) . . milliseconds : 50 . -K file-name, --kod=file-name KoD ( / Kiss-o'-Death). file-name : /var/db/ntp-kod KoD . . . -k file-name, --keyfile=file-name -a. file-name : /etc/ntp.keys . sntp -a keyno . ntp.keys(5) . -l file-name, --logfile=file-name . logfile . -M number, --steplimit=number steplimit (slew) . . number : 0 steplimit adjtime(2) . (step) settimeofday(2) . 0 . . -o number, --ntpversion=number int NTP . . number : 0 7 number : 4 NTP . -r, --usereservedport NTP ( ). NTP . -S, --step settimeofday(2). -s, --slew adjtime(2). -t seconds, --timeout=seconds . . seconds : 5 sntp . () . sntp (broadcast) . --wait, --no-wait ( ). no-wait . . . -?, --help . -!, --more-help (pager). -> [cfgfile], --save-opts [=cfgfile] cfgfile. (OPTION PRESETS) . . -< cfgfile, --load-opts=cfgfile, --no-load-opts cfgfile. no-load-opts . --no-load-opts . --version [{v|c|n}] . `v' . `c' `n' . (OPTION PRESETS) not presettable ( ) ("RC" ".INI") : SNTP_ SNTP ( ). homerc "$HOME" ".". .ntprc . (USAGE) sntp ntpserver.somewhere . sntp -Ss -M 128 ntpserver.somewhere cron(8) sntp -Ss -M 128 ntpserver.somewhere (slew) (step) . sntp -S ntpserver.somewhere cron(8) sntp -S ntpserver.somewhere () () ntpdate(1) rdate(8). (ENVIRONMENT) (OPTION PRESETS) . (FILES) (OPTION PRESETS) . (EXIT STATUS) : 0 (EXIT_SUCCESS) . 1 (EXIT_FAILURE) . 66 (EX_NOINPUT) . 70 (EX_SOFTWARE) libopts . autogen- users@lists.sourceforge.net . . (AUTHORS) Johannes Maximilian Kuehn Harlan Stenn Dave Hart (COPYRIGHT) (C) 1992-2024 Network Time Foundation . NTP : . (BUGS) bugs@ntp.org https://bugs.ntp.org . (NOTES) AutoGen sntp . 4.2.8p18 25 May 2024 sntp(1)