-f synchronize to a file server. If timeserver is missing, use /srv/boot .
-r synchronize to the local real time clock, #r/rtc .
-L used with -r to indicate the real time clock is in local time rather than GMT. This is useful on PCs that also run the Windows OS.
-n synchronize to an NTP server. If timeserver is missing, dial the server udp!$ntp!ntp .
-D print debugging to standard error
-d put file containing last determined clock frequency in directory dir , default /tmp .
-i stands for impotent. Timesync announces what it would do but doesn't do it. This is useful for tracking alternate time sources.
-a specifies the accuracy in nanoseconds to which the clock should be synchronized. This determines how often the reference clock is accessed.
-G causes timesync to use a gps server (see gpsfs (8)) as a time source.
-s causes timesync to listen for UDP NTP requests on the network rooted at netroot . Up to 4 -s options are allowed.
-S sets the stratum number to stratum .
-l turns on logging to /sys/log/timesync .
/tmp/ts.<sysname>.<type>.timeserver where the last frequency guess is kept