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This approach is very useful if your script needs to perform some action based on only one component of the date. For example, if you want to create a unique filename to assign to a compressed file, you could combine the values of each variable, with a .Z extension, to produce a set of strings like orange.dat.Z.
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Many system administration tasks need to be performed on a regular basis. For example, log files for various applications need to be archived nightly, and a new log file needs to be created. Often, a short script is created to perform this, by following these steps: 1. Kill the daemon affected, using the kill command. 2. Compress the logfile, using the gzip or compress command. 3. Use the time command to change the logfile name to include a timestamp, so that it can be distinguish from other logfiles. 4. Move the logfile to an archive directory, using the mv command. 5. Create a new logfile by using the touch command. 6. Restart the daemon by calling the appropriate /etc/init.d script. Instead of the administrator having to execute these commands interactively at midnight, they can be scheduled to run daily using the cron scheduling command. Alternatively, if a job needs to be run only once at a particular time, like bringing a new Web site online at 7 A.M. one particular morning, then you can use the at scheduler. In the next section, we look at the advantages and disadvantages of each scheduling method.
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7:
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You can schedule a single system event for execution at a specified time by using the at command. The jobs are specified by files in the /var/spool/cron/atjobs directory, while configuration is managed by the file /etc/cron.d/at.deny. The job can either be a single command or refer to a script that contains a set of commands. Imagine that you want to start up sendmail at a particular time. Perhaps some scheduled maintenance of the network infrastructure is scheduled to occur until 8:30 A.M. tomorrow morning, but you really don t feel like logging in early and starting up sendmail (you ve switched it off completely during the outage to prevent users from filling the queue). The following adds to the queue a job that is scheduled to run at 8:40 A.M., giving the network guys a ten-minute window:
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bash-2.05$ at 0840 at> /usr/lib/sendmail -bd at> <EOT> commands will be executed using /bin/ksh job 954715200.a at Mon Apr 3 08:40:00 2004
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After submitting a job using at, you can check that the job is properly scheduled by checking whether an atjob has been created:
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bash-2.05$ cd /var/spool/cron/atjobs bash-2.05$ ls -l total 8 -r-Sr--r-1 paul other 3701 Apr
3 08:35 954715200.a
The file exists, which is a good start. Now check that it contains the appropriate commands to run the job:
bash-2.05$ cat 954715200.a : at job : jobname: stdin : notify by mail: no export PWD; PWD='/home/paul' export _; _='/usr/bin/at' cd /home/paul umask 22 ulimit unlimited /usr/lib/sendmail -bd
Part II:
System Essentials
This looks good. After 8:40 A.M. the next morning, the command should have executed at the appropriate time, and some output should have been generated and sent to you as a mail message. Take a look at what the message contains:
From paul Sat Apr 1 08:40:00 2004 Date: Sat Apr 1 2000 08:40:00 +1000 (EST) From: paul <paul> To: paul Subject: Output from "at" job Your "at" job on tango "/var/spool/cron/atjobs/954715200.a" produced the following output: /bin/ksh[5]: sendmail: 501 Permission denied
Oops! The job needs to be submitted as root: normal users don t have permission to start sendmail in the background daemon mode. You would need to submit this job as root to be successful.
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