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Put this sort of possibly-might-change variable (for example, the e-mail address that you want to send output to or the location of a particular file) before any other variables, as well, so they re easy to spot Resign yourself to the fact that things will change, and the just-one-time script will still be here in six months time when you rearrange your filesystems and all your directories change At this point, first some of your scripts will break, and second you will have to fix them Make that fix a two-second job rather than a searchand-replace-through-every-file job When you pass variables into a script or a subroutine, don t just use the default names (for example, $_[0] or @_ for a Perl subroutine) Instead, give them real names immediately, and use those thereafter as in line 23.

ampersands (&), and any other exotic characters have no special meaning in the syntax descriptions in this appendix; therefore, you should enter them verbatim.

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Finally, you will want the GameKit.h header file to be available in all of your project s source files. Instead of adding it to each and every source file, you should add it to your project s Prefix.pch file. This is the precompiled header that contains header files from external frameworks to allow the project to compile faster. But it also has the added benefit that every header file added to the prefix header will make its definitions available to every source code file in the current project. The prefix header file is always prefixed with the project s name. So, for example, in the case of the tilemap project, the file name is Tilemap_Prefix.pch and the file can be found in the Other Sources group. Open the one in your project and add the GameKit header to it, as shown in Listing 14 1.

SQLPLUS {-HELP|-VERSION} SQLPLUS [-COMPATIBILITY x.y.z] [/NOLOG|name[/passwd]] [@script] [-MARKUP "options"] [-RESTRICT {1|2|3}] [-SILENT] script ::= {file[.ext]|url} [arg1 arg2 ...]} Start a SQL*Plus session or display help/version information. CONNECT name[/passwd][@database-spec] Create a new SQL*Plus session from the SQL*Plus prompt with the given name/password. DISCONNECT Commit transaction and close database session, but do not exit SQL*Plus. {EXIT|QUIT} [SUCCESS|FAILURE|WARNING|n|var] [COMMIT|ROLLBACK] Close database session and leave SQL*Plus; by default, with a COMMIT and a SUCCESS exit code for the calling environment. PASSWORD [user] Change your password (screen echo suppressed) or change the password for a specific user. SHUTDOWN [ABORT|IMMEDIATE|NORMAL|TRANSACTIONAL [LOCAL]] Shut down the Oracle instance. STARTUP [FORCE] [RESTRICT] [QUIET] [OPEN [READ ONLY]] ... Start up the Oracle instance. There are several additional options for this command.

It s a single extra line of code, and it makes it far, far easier to remember what exactly it is that you re doing with what you re passing in It will also help you remember what it is that you re passing in, rather than having to repeatedly check what variables are expected And, while you re naming variables, name them something sensible that is going to be meaningful when you return to the file, say, tomorrow morning So, use $file, not $f..

Listing 14 1. Adding the GameKit Header to Your Project s Prefix Header #ifdef __OBJC__ #import <Foundation/Foundation.h> #import <UIKit/UIKit.h> #import <GameKit/GameKit.h> #endif

/ Entering a forward slash executes the SQL command in the SQL buffer, without listing the command. DESCRIBE [schema.]obj-name Display the definition/structure of the specified object. Use the SET DESCRIBE command to influence the DESCRIBE command. EXECUTE plsql-statement

Summary

Books can and have been written on proper testing, but that s overkill on a quick script. However, you should do basic testing on even a junk script. (If there s any possibility of it being used more than once, put in basic error handling as well.) If you don t test it and you accidentally delete something important or wipe the log data you ve spent the last month collecting, you ll be very irritated with yourself. Test edge cases, and check what happens if the input is bad (too many or too few arguments, a word instead of a number, or vice versa). Testing in chunks is also useful check that the first half of the script is generating what you want it to before you start writing (or at least before you start testing) the processing in the second part. Printing to screen (print in Perl or echo in bash, as in line 25 of the script in recipe 1-7) is a quick and easy way to debug. Remember to comment it out afterward if you don t need it; even better would be to set a debug variable and use that to control whether the debug output is printed:

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