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You can add any new directory path you want to the PATH variable. This can be useful if you have created several of your own Linux commands using shell scripts. You could place these new shell script commands in a directory you created and then add that directory to the PATH list. Then, no matter what directory you are in, you can execute one of your shell scripts. The PATH variable will contain the directory for that script, so that directory will be searched each time you issue a command. You add a directory to the PATH variable with a variable assignment. You can execute this assignment directly in your shell. In the next example, the user chris adds a new directory, called mybin, to the PATH. Although you could carefully type in the complete pathnames listed in PATH for the assignment, you can also use an evaluation of PATH, $PATH, in their place. In this example, an evaluation of HOME is also used to designate the user's home directory in the new directory's pathname. Notice the empty entry between two colons, which specifies the working directory.

If you add a directory to PATH yourself while you are logged in, the directory would be added only for the duration of your login session. When you log back in, the login initialization file, .bash_profile, would again initialize your PATH with its original set of directories. The .bash_profile file is described in detail a bit later in this chapter. To add a new directory to your PATH permanently, you need to edit your .bash_profile file and find the assignment for the PATH variable. Then, you simply insert the directory, preceded by a colon, into the set of pathnames assigned to PATH. The BASH_ENV variable holds the name of the BASH shell initialization file to be executed whenever a BASH shell is generated. For example, when a BASH shell script is executed, the BASH_ENV variable is checked and the name of the script that it holds is executed before the shell script. On Red Hat Linux, the BASH_ENV variable holds $HOME/.bashrc. This is the .bashrc file in the user's home directory. The .bashrc file is discussed later in this chapter. You could specify a different file if you wish, using that instead of the .bashrc file for BASH shell scripts. The PS1 and PS2 variables contain the primary and secondary prompt symbols, respectively. The primary prompt symbol for the BASH shell is a dollar sign, $. You can change the prompt symbol by assigning a new set of characters to the PS1 variable. In the next example, the shell prompt is changed to the -> symbol:

This means that 40 percent of the time the robot repeats its last movement creating a tendency to continue in the same direction The software checks to see if the random movement chosen is in the bad memory If it is not, DoMovement is called to actually perform the movement and set the variable Status to PAIN or PLEASURE if that situation occurred because of the movement If the robot experiences pain, the current state and movement are saved to the bad memory If the robot experiences pleasure, the current state and movement are saved to the good memory if they have not been saved sometime in the past Notice that no check is made to see if the painful event is already in memory because the robot will never repeat painful movements (contrast this fact with real human behavior, also see Exercise 4).

-s [!] address[/mask] [!] [port[:port]] Source address to match. With the port argument, you can specify the port. --sport [!] [port[:port]] -d [!] address[/mask] [!] [port[:port]] --dport [!][port[:port]] --icmp-type [!] typename -i [!] name[+] Source port specification. You can specify a range of ports using the colon, port:port. Destination address to match. With the port argument, you can specify the port. Destination port specification. Specify ICMP type. Specify an input network interface using its name (for example, eth0). The + symbol functions as a wildcard. The + attached to the end of the name matches all interfaces with that prefix (eth+ matches all Ethernet interfaces). Can only be used with the INPUT chain. Specify the target for a rule (specify [port] for REDIRECT target). Used with the SNAT target, rewrites packets with new source IP address. Used with the DNAT target, rewrites packets with new destination IP address. Numeric output of addresses and ports, used with L. Specify an output network interface using its name (for example, eth0). Can only be used with FORWARD and OUTPUT chains. Specify a table to use, as in t nat for the NAT table. Verbose mode, shows rule details, used with L. Expand numbers (display exact values), used with L. Match second through last fragments of a fragmented packet. Print package version. Negates an option or address. Specify a module to use, such as state. Specify options for the state module such as NEW, INVALID, RELATED, and ESTABLISHED. Used to detect packets state. NEW references SYN packets (new connections). SYN packets, new connections.

-j target [port] --to-source ipaddr[- ipaddr] [: port- port] --to-destination ipaddr [- ipaddr][: port- port] -n -o [!] name[+]