摘要：
Markdown For Typora Overview Markdown is created by "Daring Fireball" ; the original guideline is "here" . Its syntax, however, varies between differe 阅读全文
摘要：
su： 语法： su [OPTION]... [-] [USER [ARG]...] 简介： 切换到指定的user上 常用选项 (1) -,-l,--login ：不引用当前shell的环境变量，创建一个全新的，包含了user参数的HOME，SHELL，LOGNAME，PATH (2)-c,--co 阅读全文