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Figure 20-3. The software item screen for GNOME Do The elements in the software item screen are: The application icon. The name of the application. A short description. An Action/Status bar section, in which you can see if the application is already installed, choose to Install or Remove it, and follow the progress bar when performing one of those two tasks. A full-length description of what the application does. A link to the application s web site. Screenshots of the application. A description of the availability of updates for the application whether they are made available by Canonical or by the community, or by nobody.

Licensing information. Most applications are Open Source, but you will find some proprietary drivers. Package name and version.

If we didn t want to have the intermediate step of creating a view, we could combine all the operations into one SQL query as in Listing 3-14 where the name of the view has been replaced with the SQL SELECT statement, Listing 3-11, that we used to define it.

these configuration files, you can configure when a new log file should be opened and, if so, what exactly should happen to the old log file: should it be compressed or just deleted And, if it is compressed, how many versions of the old file should be kept You can use logrotate with two different kinds of configuration files. The main configuration file is /etc/logrotate.conf. In this file, generic settings are defined to tune how logrotate should do its work. Listing 3-9 shows the contents. Listing 3-9. Contents of the logrotate.conf Configuration File # see "man logrotate" for details # rotate log files weekly weekly # keep 4 weeks worth of backlogs rotate 4 # create new (empty) log files after rotating old ones create # uncomment this if you want your log files compressed #compress # uncomment these to switch compression to bzip2 compresscmd /usr/bin/bzip2 uncompresscmd /usr/bin/bunzip2 # former versions had to have the compresscommand set accordingly #compressext .bz2 # RPM packages drop log rotation information into this directory include /etc/logrotate.d # no packages own wtmp -- we'll rotate them here #/var/log/wtmp { # monthly # create 0664 root utmp # rotate 1 #} # system-specific logs may be also be configured here. In this example, some important keywords are used, and Table 3-2 describes them.

Click the Back button or the name of the department in the location bar to go back to the list of applications. Another way of finding an application is by using the Search dialog box, available at the location bar. You need to be aware that searches are targeted at the scope specified by the path bar. This is to say that if you are browsing the Get Software Education department and search for an application, only applications in that department will show up. The department software list is filtered to show only the applications that match the search terms, and in the status bar the number of matching items is shown. All operations available at a text box, such as pasting and deleting, can be used in the Search dialog box. The search is performed as you type your text; it is not necessary to press Enter or click on the magnifying glass to execute the query. If you want to remove the filter for the applications, just click the little sweeper that s inside the Search dialog box, at the right. Does all this seem too easy to be true Well, it is true, and it is all you have to do to install most of the software you will ever need within Ubuntu (as we mentioned before, at the time of writing there were 32,420 applications available at the Center!). But Ubuntu is also a versatile and flexible OS that gives you options. It allows you to install additional software through alternative sources, keep your applications up-to-date, and even use Windows applications. This is explained later in this chapter, but first we need to delve a little deeper into the theory behind Ubuntu software management to understand those processes better.

If the Ubuntu Software Center is a marvel for its beauty and simplicity, the overall Ubuntu software management system is of no lesser merit in what it enables. The Center takes advantage of years and years of previous developments that made it possible, such as the introduction of Debian packages, the apt tool, and software repositories. Let s look at those elements in a little more detail.