[Dxspider-support] crontab

[Dirk Koopman]

George

Jaime here is talking about the system crontab (which is the correct one
for this purpose), you are talking about the one in DXSpider which will
do stuff like this, but unfortunately won't deal with time because you
need root privileges.

In my view, you should *not* edit /etc/crontab - this is because, if you
upgrade to a new release of RedHat (or whatever), the /etc/crontab will
get overwritten.

So:

1. login as root (or "su -" from a normal account)
2. crontab -e (this starts vi with an empty crontab)
3. add the lines

MAILTO=""
10 1,7,13,19 * * * /usr/sbin/ntpdate -u -b -s ntp.demon.co.uk

4. exit vi and the crontab will be installed and will start to work.


I have a profound hatred of PC clocks that drift. Hence I do it four
times a day as it may have drifted a second or two in six hours.

The MAILTO, btw, stops you getting a mail message everytime it does the
ntpdate. If you leave it out (or stick a # in fornt of it) you can see
how much your clock drifts and maybe alter the number of ntpdates
accordingly).

Dirk G1TLH

On Tue, 2002-07-09 at 08:13, Jaime Robles wrote:
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> El Mar 09 Jul 2002 03:23, George Lloyd escribió:
> > Yes I've had a look at that but I'm trying to get the auto time update to
> > work with the following line but it appears to be ignored.
> > 10 01 * * * spawn("rdate -s time.nist.gov")
> I would use:
> 10 01 * * * /usr/sbin/ntpdate -u -b -s ntpserver.domain.com
> 
> You should install ntp but it works pretty well and there are many ntp servers 
> on the internet.
> 
> You can do that using two ways:
> The two ways are from root console:
> ===== 1 =====
> 
> # crontab -e
> 
> (You edit the cron file... and exit, your cron is installed.)
> 
> ===== 2 =====
> # vi /etc/crontab
> (You edit the cron file... and exit.)
> # crontab /etc/crontab
> (know your cron is installed)
> 
> ======================
> 
> You can see what is running in your cron using "crontab -l" (also from root)
> 
> Remember to run "crontab -l" if you edited the file with vi (or your preferred 
> editor) or your cron daemon won't read the new file ;-)
> 
> 
> 
> 
> - -- 
> Un saludo,
> 	Jaime Robles, EA4TV
> 	jaime at robles.nu
> 
> Visita	http://www.redlibre.net - La Red Libre de todos!		
> 	http://smsdx.net - El DXCluster en tu movil!
> 
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