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Perl has reserved a number of specially named blocks that provide some additional control over the execution of your script although these are more complex topics, we ll cover them here, as their execution will help you to understand how modules and importing and exporting objects works The four blocks are BEGIN, CHECK, INIT, and END, and they are executed in that order When you execute a Perl script, any BEGIN blocks are executed during the parsing process that is, as soon as the statements within a BEGIN block have been parsed and verified The CHECK block is executed as soon as the parsing and compilation stages have been completed, but before the actual execution of the script The INIT block runs before the main flow of the program starts The END blocks execute when the program terminates If you specify more than one of these blocks in your script, they are executed in the order in which they are parsed in the case of BEGIN and CHECK, and in reverse order in the case of INIT and END, and still in the overall order given above You can see this better using a simple script:

One significant difference between Windows and Unix operating systems is in the way in which environment variables are set Within the Unix family, there are further variations depending on the shell being used On Windows operating systems, there is the registry: Unix has no equivalent of this The Oracle database makes use of several environment variables, some of which can be set before even running the OUI The OUI will prompt for them, using the preset values as defaults On Linux, the one variable that must be set before the installer can run is DISPLAY

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print "Now in the main script\n"; die "Script abnormally terminated!\n"; CHECK { print "1st declared CHECK block\n" CHECK { print "2nd declared CHECK block\n" END { print "1st declared END block\n" } BEGIN { print "1st declared BEGIN block\n" INIT { print "1st declared INIT block\n" } BEGIN { print "2nd declared BEGIN block\n" END { print "2nd declared END block\n" } INIT { print "2nd declared INIT block\n" }

PART I Variables can be set at various levels with various degrees of persistence on a Windows system, ranging from permanent, system-wide variables set in the Windows registry to variables set interactively within a command shell As a general rule, variables set at a higher level (such as within the registry) can be overruled at a lower level (such as within a shell) The highest level for variables is in the registry The OUI creates a key in the registry,

} } } }

When executed, the script generates the following:

and defines variables for each installed Oracle product beneath this Figure 2-2 earlier shows the variables set for the ORACLE key, and then those set one level down, in the key KEY_OraDb11g_home1 At the ORACLE level, the variable inst_loc defines the location of the OUI inventory, described previously Beneath this level there are keys for each installed product In the example shown, there are two products installed: JInitiator (which is Oracle s client-side JVM for running the Forms viewing applet two versions have been installed on the system) and Database 11g In the key KEY_OraDb11g_home1 there are a number of variables, two of the more significant being the ORACLE_BASE and the ORACLE_HOME Others specify the locations of various components and the options Windows should use for automatic startup and shutdown of a database instance called ORCL TIP There is no easy way to query the value of a Windows registry variable, other than by looking at the registry with a tool such as the regeditexe registry editing tool For this reason, many DBAs like to set variables at the session level, from where they can be easily retrieved and used Figure 2-4 shows an example of doing this

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