Debugging dynamic languages

I think CLI debugger is a must-have tool ( though best and simplest debugging tool in existence are debug prints and  asserts ) To my shame I don't have much experience with CLI debuggers for dynamic languages. Moreover, I'm not sure if any debuggers exists for an early scripting languages like sed or shell scripts. The only CLI scripting language debugger I know about is a very convenient python's pdb. 

If anyone knows any CLI debugging tools for languages like Java PHP, Caml or Lisp - please post a link in comments.