Chapter 12. Using ModulesContents:
Sample Function-Oriented Interface: File::Basename A module is a building block for your program: a set of related subroutines and variables packaged so it can be reused. This chapter looks at the basics of modules: how to bring in modules that others have written, and how to write modules of your own. 12.1. Sample Function-Oriented Interface: File::BasenameTo understand what happens with use, look at one of the many modules included with a normal Perl distribution: File::Basename. This module parses file specifications into useful pieces in a mostly portable manner. The default usage: use File::Basename; introduces three subroutines, fileparse, basename, and dirname,[60] into the current package: typically, main in the main part of your program. From this point forward, within this package, you can say: [61]
my $basename = basename($some_full_path); my $dirname = dirname($some_full_path); as if you had written the basename and dirname subroutines yourself, or (nearly) as if they were built-in Perl functions.[62]
However, suppose you already had a dirname subroutine? You've now overwritten it with the definition provided by File::Basename! If you had turned on warnings, you'd see a message stating that, but otherwise, Perl really doesn't care. Copyright © 2003 O'Reilly & Associates. All rights reserved. |
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