linux 创建用户

一、添加用户

　　linux下添加用户有两条命令：adduser和useradd

　　adduser:此命令可以一键帮助创建用户目录、系统的shell，默认情况下创建同名用户组，对应的删除用户命令是deluser，通过此命令创建用户比较简单

　　useradd：此命令需要配合一些命令参数才能配置上述设置，默认无任何设置，既没有用户目录也没有shell，功能几乎一片空白，对应的删除用户命令是userdel，通过此命令创建用户比较灵活

　　

　　useradd 命令参数说明：

-d 指定用户目录，一般和-m（创建用户目录）一起使用

-s 指定shell命令工具，一般为/bin/bash即可

例如创建一个aa用户，useradd aa -d /home/aa -m -s /bin/bash

Usage: useradd [options] LOGIN
       useradd -D
       useradd -D [options]

Options:
  -b, --base-dir BASE_DIR       base directory for the home directory of the
                                new account
  -c, --comment COMMENT         GECOS field of the new account
  -d, --home-dir HOME_DIR       home directory of the new account
  -D, --defaults                print or change default useradd configuration
  -e, --expiredate EXPIRE_DATE  expiration date of the new account
  -f, --inactive INACTIVE       password inactivity period of the new account
  -g, --gid GROUP               name or ID of the primary group of the new
                                account
  -G, --groups GROUPS           list of supplementary groups of the new
                                account
  -h, --help                    display this help message and exit
  -k, --skel SKEL_DIR           use this alternative skeleton directory
  -K, --key KEY=VALUE           override /etc/login.defs defaults
  -l, --no-log-init             do not add the user to the lastlog and
                                faillog databases
  -m, --create-home             create the user's home directory
  -M, --no-create-home          do not create the user's home directory
  -N, --no-user-group           do not create a group with the same name as
                                the user
  -o, --non-unique              allow to create users with duplicate
                                (non-unique) UID
  -p, --password PASSWORD       encrypted password of the new account
  -r, --system                  create a system account
  -R, --root CHROOT_DIR         directory to chroot into
  -s, --shell SHELL             login shell of the new account
  -u, --uid UID                 user ID of the new account
  -U, --user-group              create a group with the same name as the user
  -Z, --selinux-user SEUSER     use a specific SEUSER for the SELinux user mapping
      --extrausers              Use the extra users database