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This option specifies that the log files should be created on a weekly basis. This option makes sure that four old versions of the file are saved. If the rotate option is not used, old files are deleted. The old file is saved under a new name and a new file is created. Use this option to make sure the old log files are compressed. This option specifies the command that should be used for creating the compressed log files. Use this command to specify what command to use to uncompress compressed log files. This important option makes sure that the content of the directory /etc/logrotate.d is included. In this directory, files exist that specify how to handle some individual log files.

If you visit the web site of a particular Linux application, you may find that it s available to download in a number of different formats. The program will almost certainly be available as source code the original human-readable text that the developer created. But it might also be available as a binary or a package file.

Listing 3-14. SQL to Retrieve Information from Original Tables SELECT LastName, FirstName FROM ( Member m INNER JOIN Entry e ON m.MemberID = e.MemberID) INNER JOIN Tournament t ON e.TourID = t.TourID WHERE TourType = 'Open' AND Year = 2006

Tip Linux isn t the only OS for which open source programs are created and used. There are open source projects for both Windows and Apple Macintosh, many of which are hosted at the http://sourceforge.net web site. Many other, less widely used operating systems also rely on open source software to a greater or lesser extent. Ubuntu software is hosted in Launchpad (https://launchpad.net), a web application maintained by Canonical, used also for software development and bug tracking.

As you have seen, the logrotate.conf configuration file includes some very generic code to specify how log files should be handled. In addition to that, most log files have a specific logrotate configuration file in /etc/logrotate.d/. The content of the service-specific configuration files in /etc/logrotate.d is generally more specific than the content of the generic logrotate.conf. Listing 3-10 shows the configuration script for files that are written by Apache to /var/log/apache2/. Listing 3-10. Example of the logrotate Configuration for Apache /var/log/apache2/*.log { weekly missingok rotate 52 compress delaycompress notifempty create 640 root adm sharedscripts postrotate if [ -f /var/run/apache2.pid ]; then /etc/init.d/apache2 restart > /dev/null fi endscript } This example uses some more important options. Table 3-3 provides a description of these options.

Here are the formats by which Linux software is usually distributed: Source code: Programmers write their software in various programming languages, such as C and C++, and the code that results is known as source code. To make source code usable, it must be compiled into a binary. Because the cornerstone of the Linux philosophy is the sharing of source code, you ll almost always find the source code of a program available at the developer s web site. You can then download and compile this on your own system (or, if you re so inclined, study the source code to further your understanding). Although compiling source code isn t very hard to do, it s more convenient to download either a binary version of the program or a package. Binary files: You might find that ready-made binary files are available at the developer s web site. In other words, the programmer (or a third party) has taken his or her own source code and, as a service to users of the program, compiled it so that it s ready for use as soon as it s downloaded. For example, this is how Linux versions of the Mozilla Foundation software, like Thunderbird and Firefox, are currently distributed if you download them directly from www.mozilla.com. Sometimes binary files come with scripts to help you install them. However, in most cases, you simply place the files in a convenient location on your hard disk and then run them from there.

In our relational algebra description, we joined all the tables first and then selected the appropriate rows and columns. The result of the join is an intermediate table (as in Figure 3-7) that is potentially extremely large if there are lots of members and tournaments. We could have done the algebra in a different order. We could have first selected just the Open tournaments from the Tournament table and the 2006 tournaments from the