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The following example backs up the projects directory at 2:00 A.M. every weekday:
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The same entry is listed here again using prefixes for the month and weekday:
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To specify particular months, days, weeks, or hours, you can list them individually, separated by commas. For example, to perform the previous task on Sunday, Wednesday, and Friday, you could use 0,3,5 in the day-of-week field, or their prefix equivalents, Sun,Wed,Fri.
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Cron also supports comments. A comment is any line beginning with a # sign.
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cron Environment Variables
cron also lets you define environment variables for use with tasks performed. Red Hat defines variables for SHELL, PATH, HOME, and MAILTO. SHELL designates the shell to use tasks; in this case, the bash shell. PATH lists the directories where programs and scripts can be found. This example lists the standard directories, /usr/bin and /bin, as well as the system directories reserved for system applications, /usr/sbin and /sbin. MAILTO designates to whom the results of a task are to be mailed. By default, these are mailed to the user who schedules it, but you can have the results sent to a specific user, like the administrator s e-mail address, or an account on another system in a network. HOME is the home directory for a task; in this case, the top directory. SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root HOME=/
cron.d Directory
On a heavily used system, the /etc/crontab file can become crowded easily. There may also be instances where certain entries require different variables. For example, you may need to run some task under a different shell. To help better organize your crontab tasks, you can place crontab entries in files within the cron.d directory. The files in the cron.d directory all contain crontab entries of the same format as /etc/crontab. They may be given any name. They are treated as added crontab files, with cron checking them for task to run. For example, Red Hat installs a sysstat file in the cron.d that contains crontab entries to run tools to gather system statistics.
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crontab Command
You use the crontab command to install your entries into a crontab file. To do this, first create a text file and type your crontab entries. Save this file with any name you want, such as mycronfile. Then, to install these entries, enter crontab and the name of the text file. The crontab command takes the contents of the text file and creates a crontab file in the /var/spool/cron directory, adding the name of the user who issued the command. In the following example, the root user installs the contents of the mycronfile as the root s crontab file. This creates a file called /var/spool/cron/root. If a user named justin installed a crontab file, it would create a file called /var/spool/cron/justin. You can control use of the crontab command by regular users with the /etc/cron.allow file. Only users with their names in this file can create crontab files of their own. Conversely, the /etc/cron.deny file lists those users denied use of the cron tool, preventing them for scheduling tasks. If neither file exists, access is denied to all users. If a user is not in a /etc/cron.allow file, access is denied. However, if the /etc/cron.allow file does not exist, and the /etc/cron.deny file does, then all users not listed in /etc/cron.deny are automatically allowed access. # crontab mycronfile
cron Editing
Never try to edit your crontab file directly. Instead, use the crontab command with the -e option. This opens your crontab file in the /var/spool/cron directory with the standard text editor, such as vi. crontab uses the default editor as specified by the EDITOR shell environment variable. To use a different editor for crontab, change the default editor by assigning the editor s program name to the EDITOR variable and exporting that variable. Normally, the editor variable is set in the /etc/profile script. Running crontab with the -l option displays the contents of your crontab file, and the -r option deletes the entire file. Invoking crontab with another text file of crontab entries overwrites your current crontab file, replacing it with the contents of the text file.
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