CentOS用户添加命令详解：useradd -s

useradd命令概述

useradd是Linux系统中用于创建新用户的命令，它可以从系统管理员的角度管理用户账户，包括添加、删除、修改用户信息等，useradd命令可以与-s参数结合使用,指定新用户的shell。

useradd -s参数详解

-s参数用于指定新用户的登录shell，在CentOS系统中，登录shell可以是任何可执行文件，bin/bash、/bin/sh等，下面将详细介绍useradd -s参数的使用方法。

useradd -s命令基本语法

useradd [-c comment] [-d home_dir] [-e expire_date] [-f inactive_time] [-g group] [-G group,...] [-m [-k skel_dir]] [-M] [-n] [-r] [-s shell] [-u uid] [-U] [-p passwd] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group,...] [-o] [-u uid] [-P passwd] [-r] [-d dir] [-e date] [-f days] [-g group] [-G group