Manual page for rtc(1M)
rtc - provide all real-time clock and GMT-lag management
SYNOPSIS
rtc
[
-c
] [
-z
zone-name
]
AVAILABILITY
x86
SUNWcsu
DESCRIPTION
The
/usr/sbin/rtc
command is used to reconcile the difference in the way
time is established between UNIX systems, which utilize
Greenwich Mean Time (GMT), and MSDOS systems, which utilize local time.
When used with no arguments,
rtc
displays the currently configured time zone string which was recorded
when
rtc -z zone-name
ws last run.
The
rtc
command is
not normally run from a shell prompt; it is generally invoked by the system.
Commands such as
date.1
and
rdate.1m
which are used to set the time on a system,
invoke
/usr/sbin/rtc
-c
to ensure that daylight savings time (DST)
is corrected for properly.
OPTIONS
- -c
-
This option checks for DST
and makes corrections if necessary.
It is normally run once a day by a
cron
job.
If there is no RTC time zone or
/etc/rtc_config
file,
this option will do nothing.
- -z zone-name
-
This option, which is
normally run by the system at software
installation time,
is used to
specify the time zone in which the RTC
is to be maintained.
It
updates the configuration
file
/etc/rtc_config
with the name of
the specified zone and the current
GMT lag for that zone.
If there is an existing
rtc_config
file,
this command will update it. If not, this
command will create it.
FILES
- /usr/sbin/rtc
-
The command used to provide all real-time clock and GMT lag management.
- /etc/rtc_config
-
The data file used to record the time zone and GMT lag.
This file is completely managed by
/usr/sbin/rtc,
and it is read by the kernel.
SEE ALSO
date.1
rdate.1m
Created by unroff & hp-tools.
© by Hans-Peter Bischof. All Rights Reserved (1997).
Last modified 21/April/97
