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- user
  - useradd usermod
  - passwd
  - groupadd groupmod
  - groupdel
  - who
  - w
  - shadow
  - userdel -r 用户名
  - id 用户名
  - groupdel
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- 统计文件大小和系统文件大小
- wc -l 统计结果条数
- shell
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- ffpmeg

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groupadd groupmod

mail:x:12:mail,postfix

组名:密码标识:分组id:组内用户列表

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