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require Cwd; # Makes notation Cwd:: accessible
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$here = Cwd::getcwd(); # correctly accesses function getcwd in module Cwd
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$here = getcwd(); # looks for getcwd in current file and probably fails!
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On the otherhand:
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use Cwd; # Actually imports names (symbol table) from Cwd and
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$here = getcwd(); # is equivalent to $here = Cwd::getcwd();
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Can use require with Perl prgroms -- not packages
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require "fred.pl"; # reads this file and thereby includes any functions included in file. acts like a library call in that will not read fred.pl if already done!
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