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Another useful command is whatis <command>, which provides a brief description of what a command does. The apropos <keyword> command, by contrast, displays a brief description of commands that match the keyword. Try running whatis passwd and apropos passwd to see the difference. Listing 2-20 shows the output of apropos passwd. Listing 2-20. Using apropos [juan@srv1-manila ~]$ apropos passwd chpasswd (8) - update passwords in batch mode fgetpwent_r [getpwent_r] (3) - get passwd file entry reentrantly getpwent_r (3) - get passwd file entry reentrantly gpasswd (1) - administer the /etc/group file htpasswd (1) - Manage user files for basic authentication lpasswd (1) - Change group or user password lppasswd (1) - add, change, or delete digest passwords pam_localuser (8) - require users to be listed in /etc/passwd pam_passwdqc (8) - Password quality-control PAM module Finally, you can browse information about the packages installed on the directory /usr/share/doc. You may find change logs, sample configuration files, readme files, todo files, release info, and other information that you may need.

The last two macros, IS_MY_IP_ADDRESS() and IS_MY_IP_ADDRESS_CLASS(), are used to check whether the object is the correct type. Each function will return TRUE if the object is of the specified type. The next step is to define both the MyIPAddress and MyIPAddressClass structures, as in Listing 11-3. The widget content is held by _MyIPAddress. The first member in the new widget s structure should always be an instance of the type that you are deriving from. As you can see in the listing, the MyIPAddress widget is going to be derived from GtkEntry.

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Variables are placeholders for data You can declare your own variable and place data in it For example, suppose you would like to declare a variable called A, which contains the value test To do this, all you need to do is to run the command A=test The equal sign (=) is used to assign the value on its right side to its left side In other words, A takes the value of test To get the value in the variable A, you can obtain the value in it by prefixing it with the dollar sign ($) For example, there s a command called echo, which is used to display text Try running the command echo "Hello, world!" and you will see the output "Hello World" on the screen To display the value in the variable A, you can issue the command echo "The value of A is $A".

Listing 11-3. The MyIPAddress Structure typedef struct _MyIPAddress typedef struct _MyIPAddressClass struct _MyIPAddress { GtkEntry entry; }; struct _MyIPAddressClass { GtkEntryClass parent_class; void (* ip_changed) (MyIPAddress *ipaddress); }; MyIPAddress; MyIPAddressClass;

All these problems could have been avoided if the developer was careful with his or her state In the NET environment, there s no solution to this type of bug, other than making sure data consistency is always maintained The Java runtime implements something called checked exceptions This means that when a method is called that throws an exception, the caller must either catch the exception or delegate it to the caller of the caller Checked exceptions force the programmer to realize that an exception may be thrown, and that the method needs to deal with the exception The only option in NET is to set up a try and catch block that catches all exceptions, resets the state, and throws the caught exception.

In addition to assigning the values to a variable explicitly, you can actually store a value coming from a keyboard input To do this for variable A, run the command read A Everything you type until you press Enter will be stored in A Again, you can display the contents of A by running the command echo "The value of A is $A" There are variables that affect the shell, called environment variables To see what these variables are, just run the command env, which displays the environment variables as well as their corresponding values Some of these variables, which affect all users, are configured under /etc/bashrc If you would like to customize these variables for your account only, you can override them from the bashrc file in your home directory One useful environment variable is PATH, which is used to look for binaries and scripts to run.

Caution You should not define the parent GtkEntry object in MyIPAddress as a pointer! If you do, you

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