DB<4> h p
p expr        Same as "print {DB::OUT} expr" in current package.
perldoc manpage    Runs the external doc viewer perldoc command on the
        named Perl manpage, or on perldoc itself if omitted.
        Set $DB::doccmd to change viewer.

  DB<5> h x
x expr        Evals expression in list context, dumps the result.
  DB<6> h =
= [alias value]    Define a command alias, or list current aliases.
  DB<7>