-D perl='perl-code' Specifies some perl code that is executed prior to evaluating the first perl directive. This option can be used to specify variables on the command line; for example::

  -D perl='$a=1; $b=2'

defines constants ``$a`` and ``$b`` that can
be used in the perl expression.
-D trusted      Must be specified for if directives to use any
operators normally masked out in a Safe environment.
This requirement is to prevent an if directive in a
file written elsewhere from doing destructive things
on your computer.
=end Description
=end reST