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As a DBA, you ll have to manage the passwords for various operating system accounts on the database servers that you log on to. Use the passwd command to ensure that your database operating system user is secure and available for your use.

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NOTE: If you want to uninstall these templates later, you can find them in the following folder on your hard drive: /Developer/Platforms/iPhoneOS.platform/Developer/Library/Xcode/Project Templates/Application.

If you have access to the root user, you can change passwords for other users. This example changes the password for the oracle operating system user: # passwd oracle You will then be prompted to type a new password for the oracle operating system user: Changing password for user oracle. New UNIX password: Retype new UNIX password: passwd: all authentication tokens updated successfully. To set up additional password security, use the chage program. This utility can be used to set the maximum amount of time that a password is valid. This next example is run as the root user specifies that the oracle user will have to change its password after 60 days: # chage -M 60 oracle To verify the changes to the oracle user, use the -l option: # chage -l oracle Minimum: 0 Maximum: 90 Warning: 7 Inactive: -1 Last Change: Password Expires: Password Inactive: Account Expires:

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The chage utility is part of the Shadow Password Suite. This suite includes programs such as chfn, chpasswd, chsh, dpasswd, expiry, faillog, and so on. You can add this group of programs to your system to provide extra security. These utilities allow you to encrypt user passwords in the /etc/shadow file. This shadow file is readable only with root privileges.

Here you will want to start a new project by clicking File New Project. After this, your window should look like Figure 8 5. If not, then you still need to install the XCode Project Templates as described in the previous section Installing the XCode Project Templates.

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You re installing Oracle on a database server. You don t have a system administrator. You need to become root (sometimes referred to as the superuser) so that you can add new operating system groups and user accounts.

Here you will want to choose the cocos2d Application. You will only want the Box2d or Chipmunk application template if you are planning to have heavy physics elements in your game. At this point, a project skeleton will be created for you as in Figure 8 6. (See my comparison of Box2d and Chipmunk in the Why use cocos2d section for more details about the other templates.) Under the Classes folder, you ll find HelloWorldScene.m and .h were auto-generated for you which you can now use to start building your game.

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You have to access to the root user password for this recipe to work. Use the su - command to switch to the root account. The - (hyphen) option specifies that the target user s login shell will be invoked (runs all login scripts of the target user): $ su - root

To demonstrate cocos2d, I will be using Video Poker as an example, since it is deep enough to be interesting, yet easy enough to explain cocos2d without too many distracting details. The player taps a Deal button which will then deal five cards. Then he may choose which cards to hold and tap the Deal button again. At this point, if the player has a hand which is a pair of jacks or better, then he will receive chips back according to Table 8 1.

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You should now see a prompt similar to this: Password: After a successful logon, your shell prompt will change to the # character (on most Linux systems) indicating you are now logged on as root: # You can now perform such tasks as adding the groups and users required for the database installation. To exit from the root user, type the following: # exit

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