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%INC contains: /usr/lib/perl5/5.8.5/strict.pm %INC now contains: /usr/lib/perl5/5.8.5/strict.pm /usr/lib/perl5/5.8.5/vars.pm /usr/lib/perl5/5.8.5/File/Copy.pm /usr/lib/perl5/5.8.5/File/Spec/Unix.pm /usr/lib/perl5/5.8.5/warnings/register.pm /usr/lib/perl5/5.8.5/i586-linux-thread-multi/Config.pm /usr/lib/perl5/5.8.5/Exporter.pm /usr/lib/perl5/5.8.5/warnings.pm /usr/lib/perl5/5.8.5/File/Spec.pm /usr/lib/perl5/5.8.5/Carp.pm Note that %INC contains Exporter.pm and Carp.pm, although we have not loaded them explicitly in our example. The reason for this is that the former is required and the latter is used by Copy.pm, also required in the example. For instance, the IO module is a convenience module that loads all the members of the IO:: family. Each of these loads further modules. The result is that no less than 29 modules loaded as a consequence of issuing the simple directive use IO. It should also be noted that we did not specify in our example the full path to the modules. use and require, as well as modules like ExtUtils::Installed (more on this later in the chapter), look for their modules in the paths specified by the special array @INC.

This built-in array is calculated when Perl is built and is provided automatically to all programs. To find the contents of @INC, we can run a one-line Perl script like the following for a Linux terminal: > perl e 'foreach (@INC) { print "$_\n"; }' On a Linux Perl 5.6 installation, we get the following listing of the pathnames that are tried by default for locating modules: /usr/local/lib/perl5/5.6.0/i686-linux-thread /usr/local/lib/perl5/5.6.0 /usr/local/lib/perl5/site_perl/5.6.0/i686-linux-thread /usr/local/lib/perl5/site_perl/5.6.0 /usr/local/lib/perl5/site_perl Equivalently for Windows, the Perl script is > perl -e "foreach (@INC) { print \"$_\n\";}"

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When we issue a require or use to load a module, Perl searches this list of directories for a file with the corresponding name, translating any instances of :: (or the archaic `) into directory separators. The first file that matches is loaded, so the order of the directories in @INC is significant. It is not uncommon to want to change the contents of @INC, to include additional directories into the search path or (less commonly) to remove existing directories. We have two basic approaches to doing this we can either modify the value of @INC from outside the application or modify @INC (directly or with the use lib pragma) from within it.

Figure 41-1. Branching Branching is useful for multiple releases. Say Sally is working on a minor update for the latest version of a product, but Bob is working on features for the next major release. Sally would work on a release branch while Bob continues to do his work on the trunk. Later, Sally would merge the changes on the release branch back to the trunk so that the next major release will include the change.

We can augment the default value of @INC with three external mechanisms: the -I command-line option and the PERL5OPT and PERL5LIB environment variables. The -I option takes one or more comma-separated directories as an argument and adds them to the start of @INC: > perl -I/home/httpd/perl/lib,/usr/local/extra/lib/modules perl -e 'print join "\n",@INC'

Figure 3 2. ab n 100000 localhost/index.php results Using require_once() along with the ab command, we see the resulting data indicates a response time of 99ms. Our results also indicate that the script can support 100.63 requests/second.

/home/httpd/perl/lib /usr/local/extra/lib/modules /usr/local/lib/perl5/5.8.5/i686-linux-thread /usr/local/lib/perl5/5.8.5 /usr/local/lib/perl5/site_perl/5.8.5/i686-linux-thread /usr/local/lib/perl5/site_perl/5.8.5 /usr/local/lib/perl5/site_perl We can define the same option to equivalent effect within PERL5OPT, along with any other options we want to pass: > PERL5OPT="I/home/httpd/perl/lib,/usr/local/p5lib" perl -e 'print join "\n",@INC' Note we do not include the leading minus in the environment variable; otherwise it is the same as specifying the option on the command line. However, if all we want to do is provide additional search locations, or we want to separate library paths from other options, we should use PERL5LIB instead. This takes a colon-separated list of paths in the same style as the PATH environment variable in Unix shells: > PERL5LIB="/home/httpd/perl/lib:/usr/local/p5lib" perl -e 'print join "\n",@INC'

Since @INC is an array, all of the standard array manipulation functions will work on it: # add directory to end of @INC push @INC, "/home/httpd/perl/lib"; # add current directory to start of @INC using the 'getcwd' # function of the 'Cwd' module use Cwd; unshift @INC, getcwd(); However, since the use directive causes modules to be loaded at compile time rather than run time, modifying @INC this way will not work for used modules, only required ones. To modify @INC so that it takes effect at compile time, we must enclose it in a BEGIN block:

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