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Table 28-1: Basic System Administration Description Logs a superuser into the root from a user login; the superuser returns to the original login with a CTRL-D.
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Table 28-1: Basic System Administration Description Sets a new password for the login name. With file-name as an argument, installs crontab entries in the file to a crontab file; these entries are operations executed at specified times: -e Edits the crontab file -l Lists the contents of the crontab file -r Deletes the crontab file Changes the system runlevels (see Table 28-2). Reinstalls the Linux Loader (LILO). Shuts down the system; similar to CTRL-ALT-DEL. Sets the date and time for the system. GUI tool to set system time and date.
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Although many different specialized components go into making up a system, such as servers, users, and devices, some operations apply to the system in general. These include setting the system date and time, specifying shutdown procedures, and determining the services to start up and run whenever the system boots. In addition, you can use numerous performance analysis tools to control processes and check on resource use.
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System Time and Date
You can use several different tools to set the system time and date, depending on the distribution you use. On all distributions, you can set the system time and date using the shell date command. Most users prefer to use a configuration tool. On Red Hat, you can also use the Control Panel Time tool. Recall that you set the time and date when you first installed your system. You should not need to do so again. If you entered the time incorrectly or moved to a different time zone, though, you could use this utility to change your time. You can 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., March 6, 2000 (03 for March, 06 for the day, 1459 for the time, and 00 for the year 2000):
# date 0306145900 Mon Mar 6 02:59:27 PST 2000
You can also use the Red Hat Date and Time Properties utility to change the time, date, and time zone. 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. Use the calendar to select the year, month, and date. Then use the Time boxes to set the hour, minute, and second.
The Network Time Protocol is also supported, allowing your date and time to be set by a remote server. The Time Zone panel shows a map with locations. Select one nearest you to set your time zone.
Note You can also set the time and date with the Date & Time tool in the KDE Control Center (system). You can also change the time and date on Webmin or Linuxconf, should you have them installed.
Scheduling Tasks: crontab
Although it is not a system file, a crontab file is helpful in maintaining your system. A crontab file lists actions to take at a certain time. 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. 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), and the fifth field specifies the day of the week (0-6), 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 following example backs up the projects directory at 2:00 A.M. every weekday:
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