Rails Debug pry-byebug alias

1. Install pry-byebug
2. make .pryrc file in the root directory
3. add followings to .pryrc

if defined?(PryByebug)
  Pry.commands.alias_command 'c', 'continue'
  Pry.commands.alias_command 's', 'step'
  Pry.commands.alias_command 'n', 'next'
  Pry.commands.alias_command 'f', 'finish'
end