If you only have irregular access to the Internet then
ntpdate
is useful. The package provides the
ntpdate command to query an NTP server and to update your
clock. You can do this manually as you see fit with:
$ ntpdate ntp.togaware.com
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The advantage is that you will not have regular net transmissions as
with the NTP server. This could save you up to 4MB per day. This
could also be done as a cron job, for example.
For irregular access through a modem using PPP though, a good idea is
to create a script file in /etc/ppp/ip-up.d called
ntpdate containing:
#!/bin/sh
#invoke ntpdate to set time from system clock
if [ -x /usr/sbin/ntpdate ]; then
/usr/sbin/ntpdate -s -t 5 ntp.togaware.com
/sbin/hwclock --systohc
fi
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Make sure the script is executable:
# chmod a+rx /etc/ppp/ip-up.d/ntpdate
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Then each time you connect the local clock will be synchronised with
the NTP server.
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