用户管理

以Tom做为用户名
以dev做为用户组

增加用户

sudo adduser Tom  #不建议使用useradd/userdel系列的命令

删除用户

sudo deluser Tom --remove-home # 删除Tom用户及home目录 

重置密码

sudo passwd Tom

加入用户组

sudo usermod -a -G dev Tom  #
sudo usermod -aG dev Tom # 把Tom 加入到dev用户组

离开用户组

sudo deluser Tom dev #把Tom从dev用户组移除

查询用户所属的用户组

sudo groups Tom

or

sudo cat /ect/groups |grep Tom

锁定/解锁用户

方式一

sudo usermod -L Tom

sudo usermod -U Tom

方式二

sudo passwd -l Tom

sudo passwd -u Tom

查询所有用户

sudo getent passwd  #会列出所有用户及详细信息（用户名，密码，id, uid， gid等)

sudo awk -F':' '{ print $1 }' /etc/passwd  #使用awk只过滤用户名并显示出来

用户组

创建用户组

sudo addgroup dev 

删除用户组

sudo delgroup dev --only-if-empty

查询所有用户组

sudo getent group

相同的

sudo cat /etc/group

查询用户组下面的用户

sudo cat /etc/group | grep dev

common user groups

There are a several common group names you might encounter in Linux:sudo – A member of this group can use the sudo command to elevate their privileges
wheel – This is an older method of granting sudo-like privileges
cdrom – Allows the user to mount the optical drive
adm – Allows the user to monitor Linux system logs
lpadmin – Allows the user to configure printers
plugdev – Allows the user to access external storage devices