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You learned earlier in this chapter how shell variables are used to set up your UNIX environment. It s common to set variables within shell programs, so that these variables will hold their values for as long as the shell program executes. If you re running the shell program manually, you can set the shell variables in the session you re using, and there s really no need for separate specification of shell variables in the shell program. However, you won t always run a shell program manually that defeats the whole purpose of using shell programs in the first place. Shell programs are often run as part of the cron job, and they could be run from a session that doesn t have all the environmental variables set correctly. By setting shell variables in the program, you can make sure you re using the right values for key variables such as PATH, ORACLE_SID, and ORACLE_HOME.

Peer-to-peer (P2P) systems13 gained fame in the late 1990s with Internet programs like ICQ and Napster. P2P systems are based on a decentralized distributed architecture, in which peers connected to the Internet can share resources with each other directly. In a P2P system, peers can act as traditional clients and servers simultaneously. As clients, they can request resources from other peers. As servers, they can provide resources to other peers. P2P is about sharing. If one takes the view that notifications are sharable resources, in the sense that any publisher s notifications can be of interest to any number of other subscribers, then a decentralized direct-delivery notification architecture can be considered a P2P system, as shown in Figure 3-20.

In order to write good shell scripts, you must understand how to use the test command. Most scripts involve conditional (if-then, while-do, until-do) statements. The test command helps in determining whether a certain condition is satisfied or not. The test command evaluates an expression and returns a 0 value if the condition is true; otherwise it returns a value greater than 0, usually 1. The syntax for the test command is as follows: test expression You can use the test command in conjunction with the if, while, or until constructs or use it by itself to evaluate any expression you like. Here is an example: $ test "ONE" = "one" This statement asks the test command to determine whether the string ONE is the same as the string one . You can use the test command in the implicit form (with an alias), by using square brackets instead of the test command, as shown here: $ [ "ONE" = "one" ] To find out whether the test command (or its equivalent, the square brackets) evaluated the expression "ONE" = "one" to be true or false, remember that if the result code (same as exit code) is 0, the expression is true, and otherwise it is false. To find the result code, all you have to do is use the special variable $, which will show you the exit code for any UNIX or Linux command. In our case, here is the exit code: $ test "ONE" = "one" $ echo $ 0 You can use exit codes in your shell scripts to check the execution status of any commands you use in the script.

Let s say you configured DISK as the default device, using the CONFIGURE DEFAULT DEVICE TYPE command. The actual location on disk where RMAN will create its backup files is determined in the following manner: As described earlier in the chapter, you can specify a backup location and name using the FORMAT parameter, in which case, this location will override any location you specified for the flash recovery area. Here s an example: RMAN> BACKUP DATABASE FORMAT '/tmp/%U'; /* %U generates a unique filename */ If you don t specify the FORMAT parameter in the backup command, RMAN uses the flash recovery area as the default location for storing the backups, as is the case in the following example: RMAN> BACKUP DATABASE; If you have not configured a flash recovery area and also don t specify the FORMAT parameter during the backup, RMAN will store the backups in an operating system-specific directory on disk.