CNET Wireless-G CardBus Adapter CWC-800 Manuel d'utilisateur télécharger pdf (Page 39)

UC-7400-LX Plus User’s Manual Managing Embedded Linux

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Crontab is located in the /etc/cron.d directory. Modify the file /etc/cron.d/crontab to set up your

scheduled applications. Crontab has the following format:

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 the mode of fixtime.sh

#chmod 755 fixtime.sh

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

Add the following line to the end of crontab:

* 8 * * * root/home/fixtime.sh

STEP4: Enable the cron daemon manually.

#/etc/init.d/cron start

STEP5: Enable cron when the system boots up.

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

#/etc/init.d/cron start

By default, cron service is disabled on boot. To enable cron service, please refer to the section

“Enabling and Disabling Daemons” in this chapter.

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CNET Wireless-G CardBus Adapter CWC-800 Manuel d'utilisateur Page 39