常用快捷键 https://www.cnblogs.com/kunyuanjushi/p/5951404.html
撤销与重做 https://blog.csdn.net/GYZhe/article/details/46318439
我的傻逼配置：
(global-set-key (kbd "C-s") 'save-buffer)
(global-set-key (kbd "C-z") 'undo)
(global-set-key (kbd "C-a") 'mark-whole-buffer)
(setq-default cursor-type 'bar)
(global-linum-mode t)
(setq c-default-style "awk")
(setq default-tab-width 4)
(electric-pair-mode t)