The $ syntax is merely a way to guarantee that
Perl
interprets the variable name cleanly in situations where it
might be
ambiguous.
For example:
$prefix="anti";
print "When $matter and matter meet, they
annihilate";
will print as:
When antimatter and matter meet, they annihilate.
Similar syntax is available in some shells.
Reference:
Programming Perl (Camel Book), 3rd ed., p 62.
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