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The eval block is required so that the die statement that forms the signal handler drops out of the eval setting the value of $@ rather than terminating the whole script You can then test that and decide how to proceed Of course, if the user provides some input; then the alarm is reset to zero, disabling the alarm timer and allowing you to drop out of the eval block normally We ll be looking in more detail at signals and signal handlers in 14, and at the use of the eval function in 15

As we saw in 4, Perl provides an interface to the environment variables of the current Perl interpreter using the %ENV built-in variable For example, to access the PATH value, you would use the following:

print $ENV{PATH};

What is the most likely result A [3, 7, 5] B [3, 7, 5, 9] C [3, 7, 5, 9, 1] D Compilation fails E An exception is thrown at runtime

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The environment can affect the operation of different systems in subtle ways The PATH environment variable, for example, contains the list of directories to be searched when executing an external program through exec, system, or backticks As a general rule, it s not a good idea to always rely on the values defined in the environment variables, because they are largely arbitrary In Tables 11-6 and 11-7, I ve listed the environment variables that you are likely to come across under Unix-based and Windows-based operating systems, respectively Where relevant, the tables show a probable default value that you can use The tables also list alternative locations where you can find the same information without relying on an environment variable Mac OS (but not Mac OS X, which is Unix based) and other non-interactive platforms don t rely so heavily on environment variables for the execution of scripts anyway

The number of columns for the current display None Can be useful for determining the current terminal size when developing a terminal/text interface However, it s probably better to rely on a user setting or just use the Term::* modules and let them handle the effects If you do need a base value, then use vt100, which most terminal emulators support The user s editor preference If it can t be found, then default to vi or emacs or, on Windows, to C:/Windows/Notepadexe The effective user ID of the current process Use $>, which will be populated correctly by Perl, even when using suidperl The user s home directory Try getting the information from getpwuid instead The current hostname The hostnamepl script included with the standard Perl library provides a platform-neutral way of determining the hostname The current hostname None

HOSTNAME Table 11-6

Answer (for Objective 71): D is correct MyPancakedoStuff() must be marked public If it is, then C would be correct A, B, C, and E are incorrect based on the above

11:

The number of lines supported by the current terminal window or display See COLUMNS earlier in the table The user s login Use the getlogin function or, better still, the getpwuid function with the $< variable The path to the user s mail file If it can t be found, try guessing the value; it s probably /var/mail/LOGNAME or /var/spool/mail/LOGNAME

The colon-separated list of directories to search None when looking for applications to execute Aside from the security risk of using an external list, you should probably be using the full path to the applications that you want to execute, or populating PATH within your script The parent process ID There s no easy way to find this, but it s unlikely that you ll want it anyway None

Now that you ve taken this book s first assessment exam, it s time to look at your results and figure out what they mean and what to do next As of this writing, a passing score on the OCP Java SE 6 Programmer exam is 5833 percent (35 out of 60 questions) Of course, this chapter s assessment exam had only 14 questions, so if you got 81 of the 14 questions correct, then in theory you passed! Now for the bad news We picked 14 of the easiest questions in the book to be on this first assessment exam Based on the fact that we thought these were easier than average questions, Table 1-1 is a rough guide to where you are in your studies:

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