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In the above two statements, the RobotBASIC operators & and bAND (two options for doing the same operation) cause the infrared values to be bitwise ANDed with the number 3 (binary 0011). Bitwise simply means the values of each bit position of the two numbers are ANDed together. This means the answer for each position will be a one, only if that bit position in the rst number and the same bit position in the second number, are both ones. Lets look at some examples in Fig. 5.6 to make this clearer. The number we are bANDing with the sensor value is referred to as a mask because it hides some positions (using zeros in the mask) while allowing some to go through unchanged (using ones). As you can see from Fig. 5.6 the expression will be true when either or both of the positions speci ed by the mask is a one because the only bit positions in the sensor value that are not masked are those where the mask is a one. In this example, the output will be false only if neither of the speci ed sensor positions is triggered. As we proceed through the text, you will see how the use of bitwise and logical operations can help in analyzing the meaning of all sensory data so that the robot can make decisions on its own. Refer to Sec. B.7.5 for complete information on all the logical and bitwise operations available in RobotBASIC.

To print the mail queue of messages for future delivery, you can use mailq (or sendmail -v -q) This runs Sendmail with instructions to print the mail queue The Sendmail software package contains several utilities for managing your Sendmail server (see Table 26-1) These include mailq, which displays the queue of outgoing messages; mailstats, which shows statistics on mail server use; hoststat, which provides the stats of remote hosts that have connected with the mail server; and praliases, which prints out the mail aliases listed in the /etc/aliases file Some, like mailq and hoststat, simply invoke Sendmail with certain options Others, like mailstats and praliases, are separate programs Table 26-1: Sendmail Tools Description Display status of hosts recently in contact with the mail server (Sendmail) Display list of outgoing messages (Sendmail) Generates database version of aliases file (Sendmail) Clears status information (Sendmail) Displays mail server statistics.

Generates database version of table files With no argument, it regenerates all database files Print the aliases file A security tool that restricts programs that Sendmail can run to a secure directory..

The one-factor model is a strong simplification of the Markowitz model, and the CAPM is a theory. The main criticisms of the CAPM are as follows:

Sendmail now maintains all configuration and database files in the /etc/mail directory. Here you will find the Sendmail macro configuration file, sendmail.mc, as well as several database files (see Table 26-2). Many have changed their names with the release of Sendmail 8.10. For example, the help file is now /etc/mail/helpfile instead of /etc/sendmail.ht. Specialized files provide support for certain features such as access, which lets you control access by different hosts and networks to your mail server. virtusertable lets you designate virtual hosts. These files have both a text and database version. The database version ends with the extension .db and is the file actually used by Sendmail. You would make your entries in the text version and then effect the changes by generating a corresponding database version. Database versions are generated using the makemap command with the hash option and a redirection operation for the text and database file. For example, to deny access to a particular host, you would place the appropriate entry for it in the /etc/mail/access file, editing the file using any text word processor. Then, to generate the /etc/mail/access.db version of the access file, you would change to the /etc/mail directory and use the following command:

FIGURE 5.6 Results when various bumper conditions are bitwise ANDed with the number 3 (0011).

Alternatively, you can use the shutdown command with the -h option. With the -r option, it shuts down the system and then reboots it. In the next example, the system is shut down after five minutes. To shut down the system immediately, you can use +0 or the word now (see 29 for more details).

Note Shutting down involves a series of important actions, such as unmounting file systems and shutting down any servers (never simply turn off the computer). You can also reboot your system from the login prompt. Logging out does not shut down the system: it is still running and has control of your machine. To shut down and reboot your system, hold down the CTRL and ALT keys, and then press the DEL key (CTRL-ALT-DEL). You system will go through the standard shutdown procedure and then reboot your computer. At this point it is safe to turn off your computer if you wish, or just let the system restart. When you shut down, you will see several messages as Linux shuts itself down. It is not finished until you see the "System is halted" message. If you are rebooting, Linux will shut down and then reboot your system, at which time you can turn it off if you wish. The following steps include all the startup and shutdown procedures for the command line interface: