Capistrano 3 execute arbitrary command on remote server

Capistrano 3 does not use command cap env shell anymore.

Now we should use cap env console

But it is not interactive and we can not use for example arrow keys for history or autocompletion on tab button

And what should I do?

I suggest to write your own little rake task to do it. Use readline gem First of all thanks to follow materials:

1. https://thoughtbot.com/blog/tab-completion-in-gnu-readline-ruby-edition

2. How to write a Ruby command line app that supports tab completion?

desc "Remote console" 
task :console do
  require 'readline'
  # https://thoughtbot.com/blog/tab-completion-in-gnu-readline-ruby-edition

  host_args = (ENV['HOSTS'] || '').split(',').map { |r| r.to_sym }
  role_args = (ENV['ROLES'] || '').split(',').map { |r| r.to_sym }

  LIST = `ls /usr/bin`.split("\n").sort + `ls /bin`.split("\n").sort

  comp = proc { |s| LIST.grep(/^#{Regexp.escape(s)}/) }

  Readline.completion_append_character = " "
  Readline.completion_proc = comp

  while line = Readline.readline('cap> ', true)
    begin
      next if line.strip.empty?
      exec_cmd(line, host_args, role_args)
    rescue StandardError => e
      puts e
      puts e.backtrace
    end
  end
end

def exec_cmd(line, host_args, role_args)
  line = "RAILS_ENV=#{fetch(:stage)} #{line}" if fetch(:stage)
  cmd = "bash -lc '#{line}'"
  puts "Final command: #{cmd}"
  if host_args.any?
    on hosts host_args do
      execute cmd
    end
  elsif role_args.any?
    on roles role_args do
      execute cmd
    end
  else
    on roles :all do
      execute cmd
    end
  end
end

And do what you want with it, cheers! =))