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By naming this collection of behaviors and storing it outside of the main program, you are able to refer back to them from multiple programs and solve problems in manageable chunks.Modular programs are more easily tested and maintained because you avoid repeating code, so you only have to change it in one place.Now I am going to setup a module library that is independent of the Perl version, and not going to become broken when OS X is upgraded.Now the my module library is independent of the installed Perl version, and won’t get wiped out by an OS update.When your code uses the module, you know that it will always create MD5 digests in the same way.Without modules, different programs might contain duplicate code or various re-implementations of the algorithm.When you implement a login system (such as a user on a website or a multi-user computer), you want the user to know their password, but it's best if that password isn't left lying around somewhere on the computer where others might find it.
Each time an upgrade to OS X comes along, I end up have to go through a whole mess of updating Perl modules. I made the mistake of writing a utility in Perl that relies on several CPAN modules, including Curses, Curses:: UI, Mac::i Tunes:: Library, and File:: Home Dir. I should remake this utility in something else, but when Perl is working the utility works like I need it to.Now we need some code to challenge a user to login and check whether they are 1) a valid user and 2) know the correct password.constructs are new to you, review the (todo: link) Text Processing Tutorial.Notice how the outputs of our md5and the system command are the same (except that the system md5sum outputs a '-' representing the "filename" of the piped-in data.) When you $ PERL5LIB=also perl -Ilib -E 'say for @INC' lib also /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .
effect allows you to install a newer version of a module which will take precedence over the one shipped with Perl.
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