For example, for main: 
foreach my $name (sort keys %{*main::}){
print "Symbol '$name'\n";
}

[download]
chas
(Update: Using BUU's construction if the name is in a variable.
Update 2: That construction seemed fine when $package="main", but doesn't seem right for cases such as $package="HTML::Parser", when the :: appears. For such cases, tlm's construction seems to give the desired result.)

In reply to Re: look up the symbol table of a variable by chas
in thread look up the symbol table of a variable by eod

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