By Paul Grice
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The distribution file (named explicitly, by bundle, or inferred from the module requested) is fetched from the first configured CPAN mirror and unpacked. PL followed by make. ❑ Next, the module is tested using make test. For most distributions this executes a test suite implemented using the Test and Test::Harness modules. If this stage fails, the module installation aborts with an error, unless we used the force modifier, which is explained shortly. ❑ Finally, if the distribution passed the test stage, it is installed into Perl's library.
At various points throughout the book we will need to install Perl modules, all of which are available from CPAN. 4 Introduction Although not required, some knowledge of UNIX/Linux may be helpful when dealing with certain topics. Source Code We have tried to provide example programs and code snippets that best illustrate the concepts discussed in the text. com This code is available under the terms of the GNU Public License. We suggest you get hold of a copy to save yourself a lot of typing, although almost all the code you need is listed in the book.
If CPAN has never been configured before it will run through a set of questions to get itself up and running. Like Perl's build configuration a lot of these are self-evident, and others are computed by default. However, the module needs to fetch several resources including a current list of CPAN mirrors during the installation process so it is very helpful (though not absolutely necessary) to have an active Internet connection during the configuration process. UNIX systems will generally have no trouble here, but non-UNIX systems will need to make sure that they have acceptable versions of at least some of the following command-line utilities: ❑ A copy of gzip ❑ A tar program ❑ A zip/unzip program (WinZip, infozip, etc) ❑ A make program (for example, dmake or nmake for Windows) ❑ A copy of the open source lynx browser (this is only necessary if Net::FTP is not installed yet) ❑ A non-interactive FTP command line client (such as ncftpget, freely available and installed on many Linux and other UNIX-like platforms) The configuration process will also ask about FTP and HTTP proxies, and then fetch a list of mirrors from which we should pick two or three in the local area.