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cron executes job three times at the same time

I have my /etc/crontab like this:

Code:

*/15 * * * *  root  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1

*/5 * * * * root ntpdate 10.1.0.1 >/dev/null 2>&1

*/15 * * * * root /root/cdr/scripts/cdrcheck.sh

I get the output of my cdrcheck.sh to e-mail. Every 15 minutes I get three emails with cdrcheck.sh output. Does it mean that cdrcheck is executed 3 times every 15 min? and why the hell it would do that??
does it have something to do with updating time with ntpdate every 5 minutes. The thing is that system time is going ahead extremely fast so I use ntpdate to synchronize time every 5 min.

Quote:

Originally Posted by rimvydazas (Post 3049150)

I have my /etc/crontab like this:

Code:

*/15 * * * *  root  test -x /usr/lib/cron/run-crons && /usr/lib/cron/run-crons >/dev/null 2>&1

*/5 * * * * root ntpdate 10.1.0.1 >/dev/null 2>&1

*/15 * * * * root /root/cdr/scripts/cdrcheck.sh

I guess I answered my own question. Disabling ntpdate to run every five minutes solves the problem. However, then I have time issue. Any ideas how to fool the system while using ntpdate and executing cdrcheck only once every 15 minutes?

Sounds like you need ntpd, the Network Time Protocol daemon.