Pragma for testing programs against a package
before the package has been installed. Given a
directory path, blib starts in that directory to look for a
blib directory structure; if it doesn't find one there, it
works its way back
up five levels. If no path is specified, it starts looking in the
current directory.
blib is meant to be used from the command line:
However, you can also call it from a Perl program:perl -Mblib script [args...] perl -Mblib=dir script [args...]
use blib; use blib 'dir';