+=item o
+X<debugger command, o>
+
+Display all options.
+
+=item o booloption ...
+X<debugger command, o>
+
+Set each listed Boolean option to the value C<1>.
+
+=item o anyoption? ...
+X<debugger command, o>
+
+Print out the value of one or more options.
+
+=item o option=value ...
+X<debugger command, o>
+
+Set the value of one or more options. If the value has internal
+whitespace, it should be quoted. For example, you could set C<o
+pager="less -MQeicsNfr"> to call B<less> with those specific options.
+You may use either single or double quotes, but if you do, you must
+escape any embedded instances of same sort of quote you began with,
+as well as any escaping any escapes that immediately precede that
+quote but which are not meant to escape the quote itself. In other
+words, you follow single-quoting rules irrespective of the quote;
+eg: C<o option='this isn\'t bad'> or C<o option="She said, \"Isn't
+it?\"">.
+
+For historical reasons, the C<=value> is optional, but defaults to
+1 only where it is safe to do so--that is, mostly for Boolean
+options. It is always better to assign a specific value using C<=>.
+The C<option> can be abbreviated, but for clarity probably should
+not be. Several options can be set together. See L</"Configurable Options">
+for a list of these.
+
+=item < ?
+X<< debugger command, < >>
+
+List out all pre-prompt Perl command actions.
+
+=item < [ command ]
+X<< debugger command, < >>
+
+Set an action (Perl command) to happen before every debugger prompt.
+A multi-line command may be entered by backslashing the newlines.
+
+=item < *
+X<< debugger command, < >>
+
+Delete all pre-prompt Perl command actions.
+
+=item << command
+X<< debugger command, << >>
+
+Add an action (Perl command) to happen before every debugger prompt.
+A multi-line command may be entered by backwhacking the newlines.
+
+=item > ?
+X<< debugger command, > >>
+
+List out post-prompt Perl command actions.
+
+=item > command
+X<< debugger command, > >>
+
+Set an action (Perl command) to happen after the prompt when you've
+just given a command to return to executing the script. A multi-line
+command may be entered by backslashing the newlines (we bet you
+couldn't have guessed this by now).
+
+=item > *
+X<< debugger command, > >>
+
+Delete all post-prompt Perl command actions.
+
+=item >> command
+X<<< debugger command, >> >>>
+
+Adds an action (Perl command) to happen after the prompt when you've
+just given a command to return to executing the script. A multi-line
+command may be entered by backslashing the newlines.
+
+=item { ?
+X<debugger command, {>
+
+List out pre-prompt debugger commands.
+
+=item { [ command ]
+
+Set an action (debugger command) to happen before every debugger prompt.
+A multi-line command may be entered in the customary fashion.
+
+Because this command is in some senses new, a warning is issued if
+you appear to have accidentally entered a block instead. If that's
+what you mean to do, write it as with C<;{ ... }> or even
+C<do { ... }>.
+
+=item { *
+X<debugger command, {>
+
+Delete all pre-prompt debugger commands.
+
+=item {{ command
+X<debugger command, {{>
+
+Add an action (debugger command) to happen before every debugger prompt.
+A multi-line command may be entered, if you can guess how: see above.
+
+=item ! number
+X<debugger command, !>
+
+Redo a previous command (defaults to the previous command).
+
+=item ! -number
+X<debugger command, !>
+
+Redo number'th previous command.
+
+=item ! pattern
+X<debugger command, !>
+
+Redo last command that started with pattern.
+See C<o recallCommand>, too.
+
+=item !! cmd
+X<debugger command, !!>
+
+Run cmd in a subprocess (reads from DB::IN, writes to DB::OUT) See
+C<o shellBang>, also. Note that the user's current shell (well,
+their C<$ENV{SHELL}> variable) will be used, which can interfere
+with proper interpretation of exit status or signal and coredump
+information.
+
+=item source file
+X<debugger command, source>
+
+Read and execute debugger commands from I<file>.
+I<file> may itself contain C<source> commands.
+
+=item H -number
+X<debugger command, H>
+
+Display last n commands. Only commands longer than one character are
+listed. If I<number> is omitted, list them all.
+
+=item q or ^D
+X<debugger command, q>
+X<debugger command, ^D>
+
+Quit. ("quit" doesn't work for this, unless you've made an alias)
+This is the only supported way to exit the debugger, though typing
+C<exit> twice might work.
+
+Set the C<inhibit_exit> option to 0 if you want to be able to step
+off the end the script. You may also need to set $finished to 0
+if you want to step through global destruction.
+
+=item R
+X<debugger command, R>
+
+Restart the debugger by C<exec()>ing a new session. We try to maintain
+your history across this, but internal settings and command-line options
+may be lost.
+
+The following setting are currently preserved: history, breakpoints,
+actions, debugger options, and the Perl command-line
+options B<-w>, B<-I>, and B<-e>.
+
+=item |dbcmd
+X<debugger command, |>
+
+Run the debugger command, piping DB::OUT into your current pager.
+
+=item ||dbcmd
+X<debugger command, ||>
+
+Same as C<|dbcmd> but DB::OUT is temporarily C<select>ed as well.
+
+=item = [alias value]
+X<debugger command, =>
+
+Define a command alias, like
+
+ = quit q
+
+or list current aliases.
+
+=item command
+
+Execute command as a Perl statement. A trailing semicolon will be
+supplied. If the Perl statement would otherwise be confused for a
+Perl debugger, use a leading semicolon, too.
+
+=item m expr
+X<debugger command, m>
+
+List which methods may be called on the result of the evaluated
+expression. The expression may evaluated to a reference to a
+blessed object, or to a package name.
+
+=item M
+X<debugger command, M>
+
+Display all loaded modules and their versions.
+
+=item man [manpage]
+X<debugger command, man>
+
+Despite its name, this calls your system's default documentation
+viewer on the given page, or on the viewer itself if I<manpage> is
+omitted. If that viewer is B<man>, the current C<Config> information
+is used to invoke B<man> using the proper MANPATH or S<B<-M>
+I<manpath>> option. Failed lookups of the form C<XXX> that match
+known manpages of the form I<perlXXX> will be retried. This lets
+you type C<man debug> or C<man op> from the debugger.
+
+On systems traditionally bereft of a usable B<man> command, the
+debugger invokes B<perldoc>. Occasionally this determination is
+incorrect due to recalcitrant vendors or rather more felicitously,
+to enterprising users. If you fall into either category, just
+manually set the $DB::doccmd variable to whatever viewer to view
+the Perl documentation on your system. This may be set in an rc
+file, or through direct assignment. We're still waiting for a
+working example of something along the lines of:
+
+ $DB::doccmd = 'netscape -remote http://something.here/';
+
+=back
+
+=head2 Configurable Options
+
+The debugger has numerous options settable using the C<o> command,
+either interactively or from the environment or an rc file.
+(./.perldb or ~/.perldb under Unix.)