Wieso ist dieser Array leer?

[Frank Schönmann]

hi!

Die Elemente von @lines werden nach und nach $line zugewiesen. Änderungen an $line ändern die
Elemente im Array !!!
bist du dir da sicher? Kannst du es beweisen? ;)

perldoc perlsyn:

=== cut ===
  Foreach Loops

[...]

The foreach' keyword is actually a synonym for the for' keyword, so
    you can use foreach' for readability or for' for brevity. (Or because
    the Bourne shell is more familiar to you than *csh*, so writing for'     comes more naturally.) If VAR is omitted, $_' is set to each value. If
    any element of LIST is an lvalue, you can modify it by modifying VAR
    inside the loop. That's because the `foreach' loop index variable is an
    implicit alias for each item in the list that you're looping over.
=== cut ===

Beweis:

=== cut ===
#!/usr/bin/perl

@array = (1, 2, 3);

print @array;
for (@array)
{
    $_++;
}
print @array;
=== cut ===

bye, Frank!