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31.4. use blib
From the command line:
% perl -Mblib program [args...]
% perl -Mblib=DIR program [args...]
From your Perl program:
use blib;
use blib 'DIR';
This pragma is intended primarily as a way of testing arbitrary
Perl programs against an uninstalled version of a package through
Perl's -M command-line switch. It assumes your
directory structure was produced by the standard
ExtUtils::MakeMaker module.The pragma looks for a blib directory structure
starting in the directory named DIR (or
current directory if none was specified), and if it doesn't find a
blib directory there, works its way back up
through your ".." directories, scanning up to five
levels of parent directory.