Which debugger to be using

irb, ruby-debug,rdb,rdebug .... gee? Which is the stable debuger we
should be using lately?

irb, ruby-debug,rdb,rdebug .... gee? Which is the stable debuger we
should be using lately?

irb is not a debugger, ruby-debug and rdebug are the same thing
(rdebug is the name of the executable that the ruby-debug gem gets you).

Install the ruby-debug gem and you should be fine.

Fred