perl - perl -d 中的 x 和 p 有什么区别？

Question

  x|m expr       Evals expr in list context, dumps the result or lists methods.
  p expr         Print expression (uses script's current package).

它们对我来说看起来很相似，有什么不同？

另外，shell环境中是否有像上/下箭头键这样的快捷键？

Answer 1

参见perldoc perldebug :

p expr Same as "print {$DB::OUT} expr" in the current package. In particular, because this is just Perl's own "print" function, this means that nested data structures and objects are not dumped, unlike with the "x" command.

和

Readline Support / History in the debugger As shipped, the only command-line history supplied is a simplistic one that checks for leading exclamation points. However, if you install the Term::ReadKey and Term::ReadLine modules from CPAN (such as Term::ReadLine::Gnu, Term::ReadLine::Perl, ...) you will have full editing capabilities much like GNU readline(3) provides. Look for these in the modules/by-module/Term directory on CPAN.