1. 复制/bin目录到当前目录下，并将文件打包成bin.tar（用gzip压缩)

[root@redhat-9 ~]# cp -r /bin .
[root@redhat-9 ~]# tar -cvf bin.tar bin
bin
[root@redhat-9 ~]# gzip bin.tar

2. 删除当前目录下胡bin子目录，将bin.tar文件解压至当前目录下

 

[root@redhat-9 ~]# rm -rf 胡bin
[root@redhat-9 ~]# tar -xvf bin.tar -C .
[root@redhat-9 ~]# 

3. 创建用户win1，UID、GID等均按默认

[root@redhat-9 ~]# useradd win1
[root@redhat-9 ~]# ls /home
fox  redhat  temp1  temp2  test2  test4  win1
[root@redhat-9 ~]# id win1
uid=3005(win1) gid=3006(win1) groups=3006(win1)

4. 创建用户win2，默认主目录为/think，其余默认

[root@redhat-9 ~]# useradd -d /think win2

5. 将目录dir1设定成任何人皆有读取及执行的权利，但只有拥有者可作写修改

[root@redhat-9 think]# ll
total 0
-rw-rw-r--. 1 win1 root 0 Nov 12 17:06 book.txt

6. 将win2用户名改为tin，UID改为700，密码改为1330855

[root@redhat-9 ~]# usermod -l tin -u 1200 -p 1330855 win2

查看结果：

[root@redhat-9 ~]# tail -1 /etc/passwd
tin:x:1200:3007::/think:/bin/bash

[root@redhat-9 ~]# tail -2 /etc/shadow
win1:!!:20039:0:99999:7:::
tin:$6$L/BJo8awKAvpgKe5$awsUtnAXFTxaAdmc4ifrRN3ZlQ437EZkABzOVdHgHGXr/c3Fi7S6pQIze5x.8uSn88SbA3qXzMHc3Wv/h0A9Q/:20039:0:99999:7:::

7. 删除用户testuser

[root@redhat-9 ~]# useradd testuser
[root@redhat-9 ~]# userdel testuser

8. 连同主目录一起删除tin用户

[root@redhat-9 ~]# userdel -r tin

9. 创建一个名为goup的用户组，GID为5000

[root@redhat-9 ~]# groupadd -g 5000 group
[root@redhat-9 ~]# tail -1 /etc/group
group:x:5000:

10. 试将win1添加到goup中，明文查看win1所属组

[root@redhat-9 ~]# gpasswd -a win1 group
Adding user win1 to group group
[root@redhat-9 ~]# id win1
uid=3005(win1) gid=3006(win1) groups=3006(win1),5000(group)

11. 建立source文件的符号链接,命名为target2

[root@redhat-9 ~]# ln -s source target2

12. 在/think/下建立文件book.txt，将文件所属用户变为win1，对于book.txt,给属组用户添 加写权限,取消其他用户的读写权限

[root@redhat-9 ~]# ln -s source target2
[root@redhat-9 ~]# cd /
[root@redhat-9 /]# ls
afs  bin  boot  dev  etc  home  lib  lib64  media  mnt  opt  proc  root  run  sbin  srv  sys  test  tmp  usr  var
[root@redhat-9 /]# mkdir think
[root@redhat-9 /]# cd think/
[root@redhat-9 think]# touch book.txt
[root@redhat-9 think]# shown -R win1 book.txt
bash: shown: command not found...
Similar command is: 'chown'
[root@redhat-9 think]# chown -R win1 book.txt
[root@redhat-9 think]# chomd g+w book.txt
bash: chomd: command not found...
Similar command is: 'chmod'
[root@redhat-9 think]# chmod g m book.txt
chmod: invalid mode: ‘g’
Try 'chmod --help' for more information.
[root@redhat-9 think]# chmod o- rw book.txt
chmod: cannot access 'rw': No such file or directory
[root@redhat-9 think]# ll
total 0
-rw-r--r--. 1 win1 root 0 Nov 12 17:06 book.txt
[root@redhat-9 think]# 

这里有点小错误，但基本语法是对的 

13. 修改book.txt的权限为属组可读可写，同组可读，其他用户不可读不可写

[root@redhat-9 think]# chmod 660 book.txt
[root@redhat-9 think]# ll
total 0
-rw-rw----. 1 win1 root 0 Nov 12 17:06 book.txt
[root@redhat-9 think]#