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READCLOCK(8)                System Manager's Manual               READCLOCK(8)

NAME
       readclock - read or set a real time clock

SYNOPSIS
       readclock [-nqwW2]

DESCRIPTION
       Readclock reads the real time clock and sets the operating system time.
       It is usually the second thing done in  /etc/rc,  the  first  thing  is
       setting  the  time  zone by sourcing /etc/profile.  This means that the
       clock is assumed to tell the wall clock time.  If you want to  run  the
       clock  in  GMT then you can put TZ=GMT (or any other TZ value) in front
       of the readclock command.

OPTIONS
       -n     Play-act, don't set the time nor change  the  calibration  data,
              just show what would be done.

       -q     Quiet execution. Suppresses all output.

       -w     Write  the  current  time to the hardware clock.  Dangerous, see
              BUGS.  Don't forget to use TZ=GMT in front of readclock  if  the
              clock should run in GMT.

       -W     Like -w, but also sets the status registers of the CMOS clock to
              their proper values.  (For if the clock suddenly runs at an  odd
              pace or has stopped and the BIOS doesn't repair it.)

       -2,    Add  20  to any year before 2000.  If your CMOS clock year can't
              run past 2000, then you can set it to 1980 and use -2 to correct
              the  year.  Together with -w the year minus 20 is written to the
              clock.

FILES
       /etc/profile        Timezone and other shell initialization code.

SEE ALSO
       date(1), utime(1).

BUGS
       Reported to not work on some AT's.

       May mess up the clock royally when setting it (-w).  Only if you have a
       very standard AT and you are not afraid of having your CMOS setup reset
       to the default with a "checksum error" should you use readclock to  set
       the time of the CMOS clock.  You have been warned.

AUTHOR
       Kees J. Bot (kjb@cs.vu.nl)

                                                                  READCLOCK(8)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | BUGS | AUTHOR