Update URLs mentioned in S19

S19-commandline.pod

@@ -565,17 +565,17 @@ list of arguments provided on the command-line.
 
 =item L<http://perldoc.perl.org/perlrun.html>
 
-=item L<http://search.cpan.org/~jv/Getopt-Long-2.37/lib/Getopt/Long.pm>
+=item L<http://search.cpan.org/dist/Getopt-Long/lib/Getopt/Long.pm>
 
-=item L<http://search.cpan.org/~dconway/Getopt-Euclid-v0.2.0/lib/Getopt/Euclid.pm>
+=item L<http://search.cpan.org/dist/Getopt-Euclid/lib/Getopt/Euclid.pm>
 
 =item L<http://design.perl6.org/S06.html#Declaring_a_MAIN_subroutine>
 
-=item L<http://search.cpan.org/src/AUDREYT/Perl6-Pugs-6.2.13/docs/Pugs/Doc/Run.pod>
+=item L<http://search.cpan.org/dist/Perl6-Pugs/docs/Pugs/Doc/Run.pod>
 
 =item L<http://haskell.org/ghc/docs/latest/html/users_guide/using-ghc.html>
 
-=item L<http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/java.html>
+=item L<http://docs.oracle.com/javase/8/docs/technotes/tools/unix/java.html>
 
 =back