PCFDATE(8)PCFDATE(8)NAMEpcfdate - get the time from a radio clock and set the system time
SYNOPSISpcfdate [-qsuv] [device ...]
DESCRIPTION
Get and display the date and time from a pcfclock(4) device and option‐
ally set the system time.
If no device is specified on the command line pcfdate tries to read the
time from /dev/pcfclocks/[0-2] and /dev/pcfclock[0-2].
pcfdate is usually executed at boot time to set the system time.
Never run pcfdate via cron(8) to set the system time. pcfdate causes a
sudden jump forwards or backwards, which can cause a variety of prob‐
lems in a system. Always use the Network Time Protocol (NTP)
⟨http://www.ntp.org/⟩ to gradually adjust the time. A minimal
/etc/ntp.conf that uses the radio clock as its reference time source
typically contains the following configuration commands:
driftfile /etc/ntp.drift
server 127.127.35.0
fudge 127.127.35.0 flag2 1
OPTIONS-q Do not output the time.
-s Set the system time.
-u Output Coordinated Universal Time instead of local time.
-v Output status information.
FILES
/dev/pcfclocks/*
/dev/pcfclock*
DIAGNOSTICS
Operation not permitted
Only a privileged user may set the system time.
Resource temporarily unavailable
Another process is accessing the radio clock.
AUTHOR
Andreas Voegele
SEE ALSOpcfclock(4), settimeofday(2).
March 31, 2004 PCFDATE(8)
