Sublime text jump lines

updown.json

[
	{ "keys": ["command+down"], "command": "plus_line", "args": {"lines": 10}},
	{ "keys": ["command+up"], "command": "minus_line", "args": {"lines": 10}},
]

updown.py

import sublime
import sublime_plugin


class PlusLineCommand(sublime_plugin.TextCommand):
  def run(self, edit, lines = 10):
    (row,col) = self.view.rowcol(self.view.sel()[0].begin())
    self.view.run_command("goto_line", {"line": row+1 + lines})

class MinusLineCommand(sublime_plugin.TextCommand):
  def run(self, edit, lines = 10):
    (row,col) = self.view.rowcol(self.view.sel()[0].begin())
    self.view.run_command("goto_line", {"line": row+1 - lines})