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The fact that a simulation can truly mimic the real world may be unfamiliar to you if you are not acquainted with how simulations are used nowadays. Pilots, for example, are trained on ight simulators that are so accurate and realistic that they can be used for certi cation purposes. Simulators have economic advantages over using a real airplane for training purposes, but there are other advantages too. A simulator allows situations to be tested that would otherwise be dif cult or dangerous to implement. We want, for example, commercial pilots to be able to land a plane even if one engine fails because several geese were sucked into it during approach to the runway. Simulating such an emergency on a real airplane by shutting down one of the engines is dangerous and expensive. Using a realistic simulator would be much safer and cost ef cient. Obviously, if ight simulators are going to be effective they have to feel real to the pilot being trained. They have to respond to the pilot s commands exactly like the real airplane would. In order to be useful, they have to make the pilot forget the fact that he is commanding a simulator. Flight simulators today have cockpits mounted on hydraulic actuators where the windows are actually computer screens that display what would be seen out of a real window. It is not unusual for the simulation to be so detailed that you can feel the plane bump as it rolls over the tar- lled cracks on the runway.

You can make changes or additions easily using the administration tools described in this chapter When logged in as the root user, you can also perform certain configuration operations from the command line You can manually access system configuration files, editing them and making entries yourself For example, the domain name server entries are kept in the /etc/resolvconf file You can edit this file and type in the addresses Note Configuration tools are only accessible by the root user You will first need to log in using root as your user name and providing the root password you specified during installation Configuration operations can be performed either from a GUI interface such as Gnome or KDE, or they can be performed using a simple shell command line at which you type in configuration commands.

Red Hat also provides a set of cursor-based configuration tools, referred to as the Text Mode Setup Utility, which can be run from any shell command line These tools cover a variety of tasks such as mouse, network, and X Windows System configuration (network configuration is covered in 5), and are shown in Table 4-1..

The module-path is the module to be run, and module-arguments are the parameters you want passed to that module. Though there are a few generic arguments, most modules have their own. The module-type refers to different groups of authentication management: account, authentication, session, and password. The account management performs account

If you search today you can nd programs that allow you to create simulated robots of various shapes and sizes with sensors tailored to your speci cations. Some simulators will display your creations in three dimensions on your computer screen, perhaps even complete with the appropriate shading and shadows. Unfortunately such programs are often expensive, complex to learn and use, and slow if not being run on a very fast system. RobotBASIC was developed to address all these issues. RobotBASIC is free for everyone to use. This includes individuals, clubs, schools, or any other organization. Give it to your friends, distribute it to your students, tell your club members to download it our aim is for RobotBASIC to be of utility to people of various skills and ages. The only thing you are not allowed to do with RobotBASIC is sell it.

verification, checking such account aspects as whether the user has access, or whether the password has expired. Authentication (auth) verifies who the user is, usually through a password confirmation. Password management performs authentication updates such as password changes. Session management refers to tasks performed before a service is accessed and before it is left. These include tasks like initiating a log of a user's activity or mounting and unmounting home directories. Note As an alternative to the /etc/pam.d directory, you could create one configuration file called the /etc/pam.conf file. Entries in this file have a service field, which refers to the application that the module is used for. If the /etc/pam.d directory exits, as it does in Red Hat, /etc/pam.conf is automatically ignored. The control-flag field indicates how PAM will respond if the module fails. The control can be a simple directive or a more complicated response that can specify return codes like open_err with actions to take. The simple directives are requisite, required, sufficient, and optional. The requisite directive will end the authentication process immediately if the module fails to authenticate. The required directive will only end the authentication after the remaining modules are run. The sufficient directive indicates that success of this module is enough to provide authentication unless a previous required module has failed. The optional directive indicates the module's success is not needed unless it is the only authentication module for its service. If you specify return codes, you can refine the conditions for authentication failure or success. Return codes can be given values such as die or ok. The open_err return code could be given the action die, which would stop all authentication and return failure. The /etc/pam.d/ftpwu configuration file for the FTP server is shown here. ftpwu

#%PAM-1.0 auth auth auth account session required required required required required /lib/security/pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed /lib/security/pam_stack.so service=system-auth /lib/security/pam_shells.so /lib/security/pam_stack.so service=system-auth /lib/security/pam_stack.so service=system-auth