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Since the result of a Boolean operation is a Boolean value, you can combine multiple Boolean operations in order to perform more complex multipart tests. Here s one: (email contains "@") and ((email ends with ".com") or (email ends with ".net")) and ((offset of "@" in email) > 1) The preceding script includes four expressions that result in a Boolean value: email contains "@" email ends with ".com" email ends with ".net" (offset of "@" in email) > 1 The final result is true if 1 and 4 are true and either 2 or 3 are true. Figure 9-9 shows a script that uses this Boolean operation to validate an e-mail address that a user enters. The script is in a closed loop and doesn t allow the user to leave unless a proper e-mail address has been entered. It s a good use of Boolean but is very irritating for the user!

To understand shear, we consider an object that casts a perfect circle as a shadow if no shear is present. If the shear is nonzero, the shadow will be cast as an ellipse (see Fig. 13-9). The spin coef cient used to de ne shear is a complex number. The magnitude | | determines the amount of stretching or shrinking of the axes that de ne the ellipse while the phase of de nes the orientation of the axes.

/etc/services /etc/profile /etc/shells /etc/motd Table 1-7.

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Figure 9-9. A complex expression that includes several not, and, and or operations validates a usersupplied e-mail address. Notice that the conditional statement starts like this: if not... Everything after the not operator is in parentheses. If the expression in the parentheses ultimately evaluates as true, the not operator will reverse this value to false. This means the if statement s test condition is not met, in which case it evaluates the code after the else keyword that ends the loop. If the e-mail isn t valid, the test condition evaluates as true, and the user is told to try again.

Comparison operators basically ask a simple question: is the left operand the same as the right one Sometimes the values belong to different but closely related value classes but are still considered equal; you ll look at these later in the What Value Classes Can You Use section. The result of a comparison can be either true or false. Let s look at how AppleScript deals with comparing values. The most commonly used operator is the equals (=) operator. It returns true if the left and right operands are the same: "a" = "b" -->false (5 + 5) = 10 -->true The opposite of the equals operator is the unequal operator: . On a U.S. keyboard you can insert it by pressing Option+=. However, this may vary for other keyboard layouts.

Cocoa-based applications will assign an ID to the objects of the window class, since this feature is part of the Cocoa framework.

On Red Hat systems, configuration and startup information is also kept in the /etc/sysconfig directory. Here you will find files containing definitions of system variables used to configure devices such as your keyboard and mouse. These entries were defined for you when you configured your devices during installation. You will also find network definitions as well as scripts for starting and stopping your network connections. A sample of the keyboard file /etc/sysconfig/keyboard is shown here: KEYBOARDTYPE="pc" KEYTABLE="us" Several of these files are generated by Red Hat administration tools such as redhat-config-mouse, redhat-config-keyboard, or redhat-config-network. Table 1-8 lists several commonly used tools and the sysconfig files they control. For example, redhat-configmouse generates configuration variables for the mouse device name, type, and certain features, placing them in the /etc/sysconfig/mouse file, as shown here: FULLNAME="Generic - 3 Button Mouse (PS/2)" MOUSETYPE="PS/2" XMOUSETYPE="PS/2" XEMU3="no" DEVICE=/dev/mouse Other files, like hwconf, list all your hardware devices, defining configuration variables such as its class (video, CD-ROM, hard drive), the bus it uses (PCI, IDE), its device name (such as hdd or st0), the drivers it uses, and a description of the device. A CD-ROM entry is shown here: class: CDROM bus: IDE detached: 0 device: hdd driver: ignore desc: "TOSHIBA DVD-ROM SD-M1402"

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