练习1

创建用户gentoo，附加组为bin和root，默认shell为 /bin/csh，注释信息为”Gentoo Distribution”

1 2 3

[root❄centos7 skel]☭ useradd gentoo -G bin,root -s /bin/csh -c "Gentoo Distribution" [root❄centos7 skel]☭ cat /etc/passwd |grep gentoo gentoo:x:1001:1001:Gentoo Distribution:/home/gentoo:/bin/csh

练习2

创建下面的用户、组和组成员关系

名字为admins 的组

用户natasha，使用admins 作为附属组

用户harry，也使用admins 作为附属组

用户sarah，不可交互登录系统，且不是admins 的成员， natasha，harry，sarah密码都是centos

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

[root❄centos7 skel]☭ groupadd admins [root❄centos7 skel]☭ useradd natasha -G admins [root❄centos7 skel]☭ useradd harry -G admins [root❄centos7 skel]☭ useradd sarah -s /sbin/nologin [root❄centos7 skel]☭ echo centos | passwd --stdin natasha Changing password for user natasha. passwd: all authentication tokens updated successfully. [root❄centos7 skel]☭ echo centos | passwd --stdin harry Changing password for user harry. passwd: all authentication tokens updated successfully. [root❄centos7 skel]☭ echo centos | passwd --stdin sarah Changing password for user sarah. passwd: all authentication tokens updated successfully.   [root❄centos7 skel]☭ tail -n 3 /etc/passwd natasha:x:1002:1003::/home/natasha:/bin/bash harry:x:1003:1004::/home/harry:/bin/bash sarah:x:1004:1005::/home/sarah:/sbin/nologin