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”
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[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
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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
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[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
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