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visudo, the sudoers file is locked to disallow multiple users from simultaneously editing the file. The visudo command will also perform a syntax check on any edits to the /etc/sudoers file and will save only correct entries. For example, your SA can provide root access to the oracle account by adding the following line to the /etc/sudoers file: oracle ALL=(ALL) ALL The oracle account can use sudo to execute commands (that would otherwise be required to run as the root user). For example, the groupadd command can now be run by oracle as follows: $ sudo /usr/sbin/groupadd dba The first time you run sudo, you will be prompted for your password (not the root password). For a short period of time (by default, five minutes), you will be able to run sudo without being prompted for your password again. You can also specify that only certain commands can be run with root privileges. For example, if your system administrator wanted to limit the oracle account to the commands that add groups and users, then the /etc/sudoers entry would be as follows: oracle ALL=/usr/sbin/groupadd,/usr/sbin/useradd This method allows your SA to limit access to specific commands that require root privileges. You can view the commands you are allowed to run as sudo with the following command: $ sudo -l The following output shows that this server has been configured to allow the oracle account to run the following commands: User oracle may run the following commands on this host: (root) /usr/sbin/groupadd (root) /usr/sbin/useradd

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The sudo command allows a command to be executed as the root user. The sudo permissions are maintained in the /etc/sudoers file by the system administrator. One compelling reason for using sudo is that it allows your SA to grant superuser access without having to give out the root password. This allows system administrators to temporarily grant root access to consultants who may have short-term assignments and require root access. SAs can also quickly revoke root access by deleting the appropriate entry from the /etc/sudoers file without affecting other users. Another advantage of using sudo is that it provides an audit trail. An entry is written to a system log file in the /var/log directory whenever a sudo command is issued. Additionally, you can specify a log file for sudo activity by placing the following line in the /etc/sudoers file: Defaults logfile=/var/log/sudolog After successfully adding the previous line to the /etc/sudoers file, all commands run as sudo will be logged on to /var/log/sudolog.

HelloWorld *layer = [HelloWorld node];

Java 1.0 Authentication Service Provider Interface for Containers Debugging 1.0 Support for Other Languages

Use the groupadd command to add operating system groups. Typical Oracle installations require that you add two groups named oinstall and dba. If you have root access, you can run the groupadd command as shown here: # groupadd oinstall # groupadd dba If you don t have access to a root account, then you ll need to get your system administrator to run the commands in this recipe. Sometimes SAs are amenable to granting root access via the sudo command (see recipe 3-11 for details). If you have a company requirement that a group be set up with the same group ID on different servers, then use the -g option. This example explicitly sets the group ID to 505: # groupadd -g 505 dba Sometimes it s desirable to consistently create groups with the same group ID across multiple servers. For example, in Network File System (NFS) environments, you might encounter permission problems unless the group is set up with the same group ID across multiple servers.

Now you should have two files, which look like Listings 8 1 and 8 2. Also, notice the node method here. A CocosNode is basically the super-object of all cocos2d objects. Basically, if you want to draw it or it contains something, this will be a CocosNode. The node function is generally a factory method which returns a CocosNode. In the previous example, the HowToPlay layer will be initialized using the HowToPlay node.

Sometimes as a DBA you will be required to perform system administration tasks such as adding (or deleting) users and adding (or deleting) groups. This is because in some environments, you may not have an SA available. Or you might be installing database software on your home Linux box (and you are the system administrator). Regardless of the situation, you should be familiar with these types of tasks so that you re able to build and maintain your database server. You can verify that the group was added successfully by inspecting the contents of the /etc/group file. Here are the entries created in the /etc/group file after running the commands in the Solution section of this recipe: oinstall:x:500: dba:x:501: If for any reason you need to remove a group, then use the groupdel command (see recipe 3-13 for details). If you need to modify a group, use the groupmod command.

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