The pry-debugger is very usefull. It has the following commands :
Pry.commands.alias_command 'c', 'continue'
Pry.commands.alias_command 's', 'step'
Pry.commands.alias_command 'n', 'next'
Pry.commands.alias_command 'f', 'finish'
However, I dont know how to step into. That is, when a function is called, I want the debugger to open up this function and show me its execution.
How can I do that ?
As you said @deivid, step
steps into, while next
steps next. I was mistaken.