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代码语言：javascript复制[root@h101 ntp-4.2.8p4]# /usr/local/bin/ntpd --help
ntpd - NTP daemon program - Ver. 4.2.8p4
Usage: ntpd [ -<flag> [<val>] | --<name>[{=| }<val>] ]...
[ <server1> ... <serverN> ]
Flg Arg Option-Name Description
-4 no ipv4 Force IPv4 DNS name resolution
- prohibits the option 'ipv6'
-6 no ipv6 Force IPv6 DNS name resolution
- prohibits the option 'ipv4'
-a no authreq Require crypto authentication
- prohibits the option 'authnoreq'
-A no authnoreq Do not require crypto authentication
- prohibits the option 'authreq'
-b no bcastsync Allow us to sync to broadcast servers
-c Str configfile configuration file name
-d no debug-level Increase debug verbosity level
- may appear multiple times
-D Num set-debug-level Set the debug verbosity level
- may appear multiple times
-f Str driftfile frequency drift file name
-g no panicgate Allow the first adjustment to be Big
- may appear multiple times
-G no force-step-once Step any initial offset correction.
-i --- jaildir built without --enable-clockctl or --enable-linuxcaps or --enable-solarisprivs
-I Str interface Listen on an interface name or address
- may appear multiple times
-k Str keyfile path to symmetric keys
-l Str logfile path to the log file
-L no novirtualips Do not listen to virtual interfaces
-n no nofork Do not fork
- prohibits the option 'wait-sync'
-N no nice Run at high priority
-p Str pidfile path to the PID file
-P Num priority Process priority
-q no quit Set the time and quit
- prohibits these options:
saveconfigquit
wait-sync
-r Str propagationdelay Broadcast/propagation delay
Str saveconfigquit Save parsed configuration and quit
- prohibits these options:
quit
wait-sync
-s Str statsdir Statistics file location
-t Str trustedkey Trusted key number
- may appear multiple times
-u --- user built without --enable-clockctl or --enable-linuxcaps or --enable-solarisprivs
-U Num updateinterval interval in seconds between scans for new or dropped interfaces
Str var make ARG an ntp variable (RW)
- may appear multiple times
Str dvar make ARG an ntp variable (RW|DEF)
- may appear multiple times
-w Num wait-sync Seconds to wait for first clock sync
- prohibits these options:
nofork
quit
saveconfigquit
-x no slew Slew up to 600 seconds
opt version output version information and exit
-? no help display extended usage information and exit
-! no more-help extended usage information passed thru pager
Options are specified by doubled hyphens and their name or by a single
hyphen and the flag character.
The following option preset mechanisms are supported:
- examining environment variables named NTPD_*
Please send bug reports to: <http://bugs.ntp.org, bugs@ntp.org>
[root@h101 ntp-4.2.8p4]# 
