Linux 用户笔记

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1. 添加用户

有两条命令可以做， 一个是 useradd，一个是 adduser adduser 更好用

更具体的解释:

useradd is native binary compiled with the system. But, adduser is a perl script which uses useradd binary in back-end.

adduser is more user friendly and interactive than its back-end useradd. There's no difference in features provided. http://askubuntu.com/questions/345974/what-is-the-difference-between-adduser-and-useradd

实例：

sudo adduser ftpuser

2. 查看系统当前所有用户

cut -d: -f1 /etc/passwd

http://askubuntu.com/questions/410244/a-command-to-list-all-users-and-how-to-add-delete-modify-users 我这边运行完之后有超多行，不清楚为什么

查看系统当前有哪些用户登录了

2. 修改密码

passwd 需要root权限

列出所有用户 列出所有用户组 Linux 有 user 和 usergroup

一个 user 可以属于多个 usergroup

https://www.linode.com/docs/tools-reference/linux-users-and-groups