sntp — A very
Simple Network Time Protocol client program
sntp |
[-drSs] [-g
milliseconds] [-t
seconds] host-name-or-IP |
-d- Enable debug logging.
-g
milliseconds- Gap betwen requests in milliseconds.
-n
number- Number of DNS records to use for each host argument. This does not have to
be less than, equal to, or greater than the number of records that any
host lookup returns. Numbers smaller than the number of records will fetch
only that many records. Numbers larger than the number of records will
fetch some records more than once, as required, to reach the number of
fetches desired.
-r- bind(2) the NTP reserved port (123) for source
communications.
-S- Use clock_settime(2) to set the system clock if the
offset is greater than 50 milliseconds, or
-s is
not specified.
-s- Use adjtime(2) to slew the system clock if the offset is
less than 50 milliseconds.
-t
seconds- Maximum number of seconds to wait for responses.
-z
path- Path to dump header state to. This is useful for
sntpd(8) to read from. Header data is stored on disk in
big-endian (NBO) format.
This sntp should not be confused with the
Network Time Foundation's sntp implementation. This
is a simplified client that supports a minimal subset of features for
compatibility.
This sntp first appeared in macOS
11.0.