If it's just quick and dirty, then don't use packages. In otherfile.pl, do:

our @p = (1, 2, 3, 4, 5);
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and in somefile.pl:

require "foo.pl";
our @p;
print "@p\n";
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No import/export needed (as you're using just one namespace). Of course, if you're really dirty, you can leave out the our as well - just make sure you aren't using strict either (or use full path names).