source /etc/profile关闭终端后失效要重新输入的原因
https://blog.csdn.net/cdnight/article/details/86653006?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.add_param_isCf&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.add_param_isCf