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The x option asks tar to extract the contents of the specified file. The v and f options have the same meanings as in the previous example. The cpio command with the -o (copy out) option copies files to standard output, such as disk or tape. The following command will copy the contents of the entire current directory (all the files) to the /dev/rmt/0m tape: $ ls | cpio -0 > /dev/rmt/0m The cpio command with the -i (copy in) option extracts files from standard input. The following command restores all the contents of the specified tape to the current directory: $ cpio -i < /dev/rmt/0m
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Most DBAs will have to schedule their shell programs and other data-loading programs for regular execution by the UNIX system. UNIX provides the cron table, or crontab, to schedule database tasks. In this section, you ll learn how to schedule jobs with this wonderful, easy-to-use utility. You can invoke the crontab by typing in crontab -l. This will give you a listing of the contents of crontab. To add programs to the schedule or change existing schedules, you need to invoke crontab in the edit mode, as shown here: $ crontab -e Each line in the crontab is an entry for a regularly scheduled job or program, and you edit the crontab the same way you edit any normal vi-based file. Each line in the /etc/crontab file represents a job that you want to execute, and it has the following format: minute hour day month day of week command
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The items in the crontab line can have the following values: minute: Any integer from 0 to 59 hour: Any integer from 0 to 23 day: Any integer from 1 to 31 (this must be a valid date if a month is specified) month: Any integer from 1 to 12 (or the short name of the month, such as jan or feb) day of week: Any integer from 0 to 7, where 0 and 7 represent Sunday, 1 is Saturday, and so on command: The command you want to execute (this is usually a shell script) Here s a simple example of a crontab line: #---------------------------------------------------------------------minute hour date month day of week command 30 18 * * 1-6 analyze.ksh #----------------------------------------------------------------------The preceding code indicates that the program analyze.ksh will be run Monday through Saturday at 6:30 p.m. Once you edit the crontab and input the lines you need to run your commands, you can exit out of cron by pressing Shift+WQ, just as you would in a regular vi file. You now have cronned your job, and it will run without any manual intervention at the scheduled time. It s common practice for DBAs to put most of their monitoring and daily data-load jobs in the crontab for automatic execution. If crontab comes back with an error when you first try to edit it, you need to talk to your UNIX system administrator and have appropriate permissions granted.
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Note You ll use crontab for all your regularly scheduled database or operating system jobs, but if you want to schedule a task for a single execution, you can use the at or batch command instead. Look up the man pages for more information on these two scheduling commands.
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Telnet is an Internet protocol for accessing remote computers from your PC or from another UNIX server or workstation. Your machine simply needs to be connected to the target machine through a network, and you must have a valid user account on the computer you are connecting to. To use telnet on your PC, for example, go to the DOS prompt and type telnet. At the telnet prompt, type in either the UNIX server s IP address or its symbolic name, and your PC will connect to the server. Unless you are doing a lot of file editing, telnet is usually all you need to connect and work with a UNIX server, in the absence of a terminal emulator. The following example session shows a connection to and disconnection from a server named hp50. Of course, what you can do on the server will depend on the privileges you have on that machine. $ telnet hp5 Trying... Connected to hp5.netbsa.org. Escape character is '^]'. Local flow control on Telnet TERMINAL-SPEED option ON login: oracle Password: Last successful login for oracle: Tue Nov 5 09:39:45 CST6CDT 2002 on tty Last unsuccessful login for oracle: Thu Oct 24 09:31:17 CST6CDT 2002 on tty Please wait...checking for disk quotas ... You have mail. TERM = (dtterm) oracle@hp5[/u01/app/oracle] $ Once you log in, you can do everything you are able to do when you log directly into the server without using telnet. You log out from your telnet session in the following way: $ exit logout Connection closed by foreign host. $
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