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This is an excerpt from the latest version perlfaq8.pod, which
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8.46: What's the difference between require and use?

(contributed by brian d foy)

Perl runs "require" statement at run-time. Once Perl loads, compiles,
and runs the file, it doesn't do anything else. The "use" statement is
the same as a "require" run at compile-time, but Perl also calls the
"import" method for the loaded package. These two are the same:

use MODULE qw(import list);

require MODULE;
MODULE->import(import list);

However, you can suppress the "import" by using an explicit, empty
import list. Both of these still happen at compile-time:

use MODULE ();

require MODULE;

Since "use" will also call the "import" method, the actual value for
"MODULE" must be a bareword. That is, "use" cannot load files by name,
although "require" can:

require "$ENV{HOME}/lib/"; # no @INC searching!

See the entry for "use" in perlfunc for more details.


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