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Linux常用命令-43：useradd
source link: https://xugaoxiang.com/2022/06/13/linux-cmds-43-useradd/
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useradd 命令用来创建新的用户或更改用户的信息。创建的帐号，保存在 /etc/passwd 文件中。
语法格式：useradd [参数] [用户名]
常用参数：
# 创建新的账号xugaoxiang
useradd xugaoxiang
# 创建账号，但不创建其HOME目录，也就是/home/xugaoxiang，同时禁止登录
useradd -M -s /sbin/nologin xugaoxiang
添加新用户，指定UID为666，指定用户组为root，toor成员，指定shell类型为/bin/sh
# useradd -u 666 -s /bin/sh -G root,toor xugaoxiangRecommend
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