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The preferred way to set the system time and date is to use the Red Hat Date and Time Properties utility (redhatconfig-date). Select it on the System Settings window accessible from the Start Here window. There are two panels, one for the date and time and one for the time zone (see Figure 1-1). Use the calendar to select the year, month, and date. Then, use the Time box to set the hour, minute, and second. The Time Zone panel shows a map with locations. Select the one nearest you to set your time zone. Red Hat also supports the Network Time Protocol (NTP), which allows a remote server to set the date and time. NTP allows for the most accurate synchronization of your system s clock. It is often used to manage the time and date for networked systems, freeing the administrator from having to synchronize clocks manually. The date and time panel is obtained from an NTP server. Your network may have its own, or you can use one of the public NTP servers listed at www.ntp.org. You can also download current documentation and NTP software from the www.ntp.org site.
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Figure 1-1
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You can also use the date command on your root user command line to set the date and time for the system. As an argument to date, you list (with no delimiters) the month, day, time, and year. In the next example, the date is set to 2:59 P.M., April 6, 2003 (04 for April, 06 for the day, 1459 for the time, and 03 for the year 2003): # date 0406145903 Sun Mar 6 02:59:27 PST 2003
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NOTE You can also set the time and date with the Date & Time tool in the KDE Control Center.
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Scheduling Tasks: cron
Scheduling regular maintenance tasks, such as backups, is managed by the cron service on Linux, implemented by a cron daemon. A daemon is a continually running server that constantly checks for certain actions to take. These tasks are listed in the crontab file. The cron daemon constantly checks the user s crontab file to see if it is time to take these actions. Any user can set up a crontab file of his or her own. The root user can set up a crontab file to take system administrative actions, such as backing up files at a certain time each week or month.
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TIP For a system that may normally be shut down
during times that cron is likely to run, you may want to supplement cron with anacron. For example, if a system is shutdown on a weekend when cron jobs are scheduled, then the jobs will not be performed. anacron, however, checks to see what jobs need to be performed when the system is turned on again, and then runs them. It is designed only for jobs that run daily or weekly. For anacron jobs, you place crontab entries in the /etc/ anacrontab file.
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The crond Service
The name of the cron daemon is crond. Normally, it is started automatically when your system starts up. You can set this feature using redhat-config-services or chkconfig, as described in 10. The following example starts the crond service automatically whenever you boot the system: chkconfig crond on You can also start and stop the crond service manually, which you may want to do for emergency maintenance or during upgrades. Use the service command and the stop option to shut down the service, and the start option to run it again: service crond stop
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crontab Entries
A crontab entry has six fields: the first five are used to specify the time for an action, while the last field is the action itself. The first field specifies minutes (0 59), the second field specifies the hour (0 23), the third field specifies the day of the month (1 31), the fourth field specifies the month of the year (1 12, or month prefixes like Jan and Sep), and the fifth field specifies the day of the week (0 6, or day prefixes like Wed and Fri), starting with 0 as Sunday. In each of the time fields, you can specify a range, a set of values, or use the asterisk to indicate all values. For example, 1 5 for the day-of-week field specifies Monday through Friday. In the hour field, 8, 12, 17 would specify 8 A.M., 12 noon, and 5 P.M. An * in the month-of-year field indicates every month. The format of a crontab field follows:
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