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Although Ubuntu doesn t officially support Windows applications, the Wine project is attempting to add a degree of compatibility and is currently good enough to run many of the most common Windows applications. Wine can be installed by using Ubuntu Software Center, and then applications can be installed by using the standard Windows installer. Although not every application will work, Wine supports quite a lot of software, including Microsoft Office XP, Spotify (shown in Figure 11-17), Photoshop 7, and even some games. See www.winehq.org for more information. We discuss how to install Windows applications with Wine in 20.

Summary

Having established which tables are likely to be useful for the query, we need to combine them. We ll talk about how to decide on the relevant operations for combining the tables in the Spotting Key Words in Questions section later in this chapter. For now, let s assume that you think joins look promising for the query about men entering the Leeston tournament. You don t have to do everything at once. Start slowly with some small queries to see how things shape up. To carry out a join, we need to find the fields on which to join. Review 3 if you need to refresh your understanding of join-compatible fields. The Entry table is critical to this query, as it connects the Member and Tournament tables. The Entry table has a foreign key field TourID, which we can join with the primary key of the Tournament table. Do that much first. Listing 10-2 shows the SQL, and Figure 10-5 shows a few rows of the resulting virtual table.

If a service runs from xinetd, it can be secured with TCP Wrapper. To ensure that you can use it, install TCP wrapper using apt-get install tcpd as root. Stated in a more general way, if a service is using the libwrap.so library module, you can secure it with TCP Wrapper. Because xinetd uses this module, you can secure it this way. Other services that aren t started with xinetd but do use this library can be secured with TCP Wrapper as well. To check if a service is capable of working with TCP Wrapper, use the ldd command followed by the complete name of the service you want to check. If libwrap.so is listed, TCP Wrapper works for the service. If it isn t, use a generic firewall such as iptables. See Listing 9-17 for an example. Listing 9-17. Checking If a Service Can Be Secured with TCP Wrapper root@RNA:~# ldd /usr/sbin/xinetd linux-gate.so.1 => (0xffffe000) libwrap.so.0 => /lib/libwrap.so.0 (0xb7fd0000) libnsl.so.1 => /lib/tls/i686/cmov/libnsl.so.1 (0xb7fb9000) libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0xb7f91000) libcrypt.so.1 => /lib/tls/i686/cmov/libcrypt.so.1 (0xb7f63000) libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0xb7e22000) /lib/ld-linux.so.2 (0xb7fe3000) TCP Wrapper was developed before xinetd existed and when only its predecessor inetd was available. This service didn t include any way of regulating access to services, and so inetd could be used to start tcpd, TCP Wrapper, which in turn could be configured to start the necessary service. The task of tcpd was to check if a host trying to connect to the service was allowed access or not. The nice thing about tcpd is that it sits between (x)inetd and the service a client is connecting to. Therefore, from the outside it s not possible to see whether tcpd is blocking access to a service or if the service simply isn t there.

In this chapter, you ve taken a look at some Ubuntu programs that provide vital functions that you might have used daily under Windows. The aim was to get you started with this software as quickly as possible by pointing out key features. You ve seen how some programs mirror the look and feel of their Windows counterparts almost to the letter, whereas others resolutely strike out on their own path. It takes just a little time to become familiar with Ubuntu software, and then using these programs will become second nature. In the next chapter, we move on to more fundamental Ubuntu tasks: manipulating files. However, once again, this is not too dissimilar from the Windows experience, which makes getting used to the system very easy.