Moxa Technologies 331 Manual do Utilizador descarregar pdf (Página 37)

Moxa C Programmable RTU Controllers Managing the RTU Controllers

3-8

mm h dom mon dow user command

min hour date month week user command

0-59 0-23 1-31 1-12 0-6 (0 is Sunday)

The following example demonstrates how to use Cron.

How to use Cron to update the system time and RTC time every day at 8:00.

STEP1: Write a shell script named fixtime.sh and save it to /home/.

#!/bin/sh

ntpdate time.nist.gov

hwclock –-systohc

exit 0

STEP2: Change mode of fixtime.sh

#chmod 755 fixtime.sh

STEP3: Modify /etc/cron.d/crontab file to run fixtime.sh at 8:00 every day.

Add the following line to the end of crontab:

* 8 * * * root/homefixtime.sh

STEP4: Enable the cron daemon manually.

#/etc/init.d/cron start

STEP5: Enable Cron when the system boots up.

Add the following line in the file /etc/init.d/rc.local.

#/etc/init.d/cron start

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 73 74

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Moxa Technologies 331 Manual do Utilizador Página 37