1 创建testuser uid 1234,主组：bin,辅助组：root,ftp,shell:/bin/csh home:/testdir/testuser

[root@localhost ~]# useradd -u 1234 -g bin -G root,ftp -s /bin/csh -d /testdir/testuser testuser
[root@localhost ~]# getent passwd testuser
testuser:x:1234:1::/testdir/testuser:/bin/csh
[root@localhost ~]# id testuser
uid=1234(testuser) gid=1(bin) groups=1(bin),0(root),50(ftp)

2 修改testuser uid:4321,主组：root,辅助组：nobody,loginname:test，home:/home/test 家数据迁移

    

[root@localhost ~]# usermod -u 4321 -g root -G nobody -l test -d /home/test -m testuser
[root@localhost ~]# getent passwd test
test:x:4321:0::/home/test:/bin/csh
[root@localhost ~]# id test
uid=4321(test) gid=0(root) groups=0(root),99(nobody)
[root@localhost ~]# ls -a /home/test/
.  ..  .bash_logout  .bash_profile  .bashrc  .mozilla

3 批量创建帐号：user1...user10，uid:3000-3009,shell:/bin/csh,home:/testdir/username
passwd:usernamepass

[root@localhost ~]# newusers user
[root@localhost ~]# tail /etc/passwd
user1:x:3000:3000::/testdir/user1:/bin/csh
user2:x:3001:3001::/testdir/user2:/bin/csh
user3:x:3002:3002::/testdir/user3:/bin/csh
user4:x:3003:3003::/testdir/user4:/bin/csh
user5:x:3004:3004::/testdir/user5:/bin/csh
user6:x:3005:3005::/testdir/user6:/bin/csh
user7:x:3006:3006::/testdir/user7:/bin/csh
user8:x:3007:3007::/testdir/user8:/bin/csh
user9:x:3008:3008::/testdir/user9:/bin/csh
user10:x:3009:3009::/testdir/user10:/bin/csh
[root@localhost ~]# cat passwd | chpasswd 
[root@localhost ~]# tail /etc/shadow
user1:$6$Ro5mq1VJNZ/d$LJ7EDMcsMzU5HNgzP77lk7RLNvYlSAr8uPvX65LwiK4HeiAuMuKkedds5/VS/RMpqiSYJFo4x4cUdIOgsQ8St0:17014:0:99999:7:::
user2:$6$iNkD6jcUZY/1nr$DaRBV.VLiNiK5duK.4B1xwVJ1ac4necPXc2nHlBI8LtHVmjAZx5mTxTxLKZ9wtXK6F4aGU1kObto/5pv/3LBO.:17014:0:99999:7:::
user3:$6$hxf8tQOsg7/4dv$NjhUwlNVKNdVG6GECkh4M4AnY/XSY7fL4Fn755fRaksY5F2/.qJDQSRQg8Z/PG8xUMg/4gIWcXIyGB5B4x0LC.:17014:0:99999:7:::
user4:$6$jECOmMnJQ$hTF0x6ODW8/LgB5/BppwIN7VKDc./73pAS1J46N7eEEzyrXkseMCTcv.ThyqF7/9ET7woKoSSa8elLFdJuIp20:17014:0:99999:7:::
user5:$6$cqD4l/pRk/$lwe9foncDm0sP.Gkm8Hpuf/DP43ZFRk5X9PO.5SkdLT0Hp5NgwcebIwbG3rsr5v3Ulv3kGJqMYImAmeb2iiHC0:17014:0:99999:7:::
user6:$6$7FLUgUbZX$dooi.T4njASHtXK/ClC.P6jXSpD/KmNI7vnJYInhNtrxQgd16TRp9/LBcvV5i3M6nYlNhM./nc6oCgYt2mPD0.:17014:0:99999:7:::
user7:$6$61i05/Op8LE$zpUX6P.PbjwhjmJCje54bCeY6bPy.8/Ub3M9h6F2nAJKCN/MGW4dQTwyd/JRJmVENHHG35288XX3AXNavWyaA0:17014:0:99999:7:::
user8:$6$bx0bN/uF8U$eR256H7e8K4O3cUu6iGDyTHpqME.qu3LoC7X/VZxIkAfJWfYGKJug6kRodnelcl4iPxscMrL5WAOX3LyPZ0Zl0:17014:0:99999:7:::
user9:$6$bnHrjYn.t$neTwVahU4ME0LAuV/55D0hhzHrHXcRId8h0RhuKTgRxBMj6iI2YL1qu0evzpGi1mrQRa6ONC.XHfM9.gIFiBK1:17014:0:99999:7:::
user10:$6$I5Ioe//c6fJ$vFvI/q/bFYeUAIb0vZH80NFlysqbnZyS75/slINeRL.BjrtcGfZ831/PRQAhV1yhBis3PG16ulxnG8G4FJfgQ0:17014:0:99999:7:::
Last login: Tue Aug  2 08:21:35 2016 from 10.1.250.82
[user10@localhost ~]$ pwd
/testdir/user10

课堂练习题

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"

 useradd -G bin,root -s /bin/csh -c "Gentoo Distribution" gentoo
 [root@localhost ~]# id gentoo
uid=4322(gentoo) gid=4322(gentoo) groups=4322(gentoo),0(root),1(bin)
[root@localhost ~]# groups gentoo
gentoo : gentoo root bin
[root@localhost ~]# getent passwd gentoo
gentoo:x:4322:4322:Gentoo Distribution:/home/gentoo:/bin/csh

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

[root@localhost ~]# groupadd admins
[root@localhost ~]# useradd -G admins natasha
[root@localhost ~]# useradd -G admins harry
[root@localhost ~]# useradd -s /etc/nologin sarah
[root@localhost ~]# echo "centos" | passwd --stdin natasha
Changing password for user natasha.
passwd: all authentication tokens updated successfully.
[root@localhost ~]# echo "centos" | passwd --stdin harry
Changing password for user harry.
passwd: all authentication tokens updated successfully.
[root@localhost ~]# echo "centos" | passwd --stdin sarah
Changing password for user sarah.
passwd: all authentication tokens updated successfully.
[root@localhost ~]# groups natasha
natasha : natasha admins
[root@localhost ~]# groups harry
harry : harry admins
[root@localhost ~]# groups sarah
sarah : sarah
[root@localhost ~]# getent passwd sarah
sarah:x:4325:4326::/home/sarah:/etc/nologin