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pcfdate(8)

March 31, 2004

pcfclock

Pcfclock kernel driver

NAME

pcfdate - get the time from a radio clock and set the system time

SYNOPSIS

pcfdate [-qsuv] [device ...]

DESCRIPTION

Get and display the date and time from a pcfclock(4) device and optionally 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 problems in a system. Always use the Network Time Protocol (NTP) 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

REFERENCED BY

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