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Some database installation tasks require root privileges. Sometimes there isn t an SA available to perform these tasks, or your system administrator might be comfortable with temporarily providing you access with the root account. However, competent system administrators rarely give out the root password to DBAs (or any non-SA users, for that matter). There are several problems with providing carte blanche superuser access: It s hard to trace who did what on the system Security is better administered by granting privileges on an as-needed basis and not through wide-open system access. If several people have direct access to the root password and one of them logs on to the system and accidentally removes critical files, it s hard to tell who did the damaging deed. For this reason, SAs do not usually provide direct root access. Rather, they provide auditable and/or limited access to root privileges through the sudo command (see recipe 3-11 for details).

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You want to access to commands that can be run only by root, but your security-conscious system administrator won t give you the root password.

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Have your system administrator insert the appropriate entries in the /etc/sudoers file to grant access to restricted commands. You can be granted complete root access or can be granted access to only specified commands. As the root user, use the visudo command to add an entry to the /etc/sudoers file. The visudo command ensures that the /etc/sudoers file is edited in a secure fashion. When using

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A scene is basically one screen of information. This could be a main menu, a level of a game, a game over screen, a high scores list, etc. Here you will start by making a main menu, so that the user can choose to either start a game or learn how to play or change options. This menu is an excellent opportunity to get your feet wet and learn how to switch between scenes. To start, find the auto-generated HelloWorldScene.h and HelloWorldScene.m files in the Classes folder. Remove the lines in the init section and you can now use these files as a template for any scene you would like to create. Create empty files called HowToPlayScene.h and HowToPlayScene.m, copy the contents from HelloWorldScene.h and HelloWorldScene.m into them and set their object name to HowToPlay. Also, remember to import HowToPlayScene.h and change both occurrences of HelloWorld in the following line to HowToPlay as well.

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