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Figure 14-5. New messages can be formatted in HTML, allowing you to format text and even add images to your messages. The disadvantage of HTML e-mail is that the person receiving the message will need an HTMLcompatible e-mail program to be able to read it (though most common e-mail programs can handle HTML e-mail just fine). Your mail is also more likely to be tagged as spam by the recipient s server, because of the widespread abuse of HTML and images in mail by spammers.

Now let s consider another common error. It is easy to find the people who have entered tournament 36 with the condition e.TourID = 36. It is tempting to try to retrieve the people who have not entered tournament 36 by changing the condition slightly, as in Listing 2-30.

The mail address of the administrator of your virtual host. The host name of the virtual host. Make sure that it matches the host name as used in DNS. This is a very important directive because it allows your Apache process to find the right virtual server. Every virtual host needs its own document root, and this is not the same as the document root used by your main Apache web server! It s a good idea to create a separate directory for every virtual server you re running. Don t create these directories under the document root of your main web server; instead, make a subdirectory for every virtual server that you want to run at the same level. Make sure that all files in the directory you re referring to are readable by the user www-data. The file where this virtual host logs its errors. Typically, this is a file in the /var/log/apache2 directory. Make sure that this file is writeable by the user www-data. The file that s used for generic log messages. This parameter has a default value of Off, which makes sure that your server does not try to resolve the host name for every IP address that comes in. This is very useful, as the reverse name lookup normally takes a lot of time. This sets the directory that contains the CGI script files. If your web server doesn t need to do any scripting, make sure that you disable this setting: allowing scripts to be executed by your server always carries a certain risk.

Tip Many people in the Linux community frown on HTML-formatted e-mail and prefer plain text messages.

Words are automatically spell-checked in the new e-mail, and are underlined in red if the spellchecker thinks they are incorrect. To correct the word, right-click it and then select the correct spelling from the list provided. By default, if you chose the English language during the installation of Ubuntu, the Evolution spellchecker will offer only an English (American) dictionary. You can switch to other English dialects (e.g., British, Canadian, or Australian English) by choosing Edit Preferences in the main Evolution window, clicking the Composer Preferences icon, and then clicking the Spell Checking tab. Select an alternative dictionary or multiple dictionaries by selecting the check boxes to the left of the dictionary names. While composing an e-mail, you can switch languages by choosing Edit Current Languages in the menu of the Compose Message window. If the language you require is not listed, this means that you need to install an additional Aspell dictionary package with the Ubuntu Software Center. These

used filename=${1#*/}, the pattern-matching operator would look for the first / in the complete file name and remove that and everything before it You should realize that in these examples the * is important The pattern-matching operator ${1#*/} removes the first / found and anything in front of it The pattern-matching operator ${1#/} removes the first / in $1 only if the value of $1 starts with a / However, if there s anything before the /, the operator will not know what to do In these examples, you ve seen how a pattern-matching operator is used to start searching from the beginning of a string You can start searching from the end of the string as well To do so, a % is used instead of a # This % refers to the shortest match of the pattern, and %% refers to its longest match.

dictionary packages usually have a two-letter suffix indicating the language that they support; for example, aspell-fr is the French dictionary package. You ll need to quit and restart Evolution before the new language is visible.

Listing 2-30. Incorrect SQL to Retrieve People Who Have Not Entered Tournament 36 SELECT e.MemberID FROM Entry e WHERE e.TourID <> 36