2020-02-22 第三周作业

▲就业班和全程班的小伙伴看这里:(学习老王视频的作业第5-6节)

1、显示/etc目录下,以非字母开头,后面跟了一个字母以及其它任意长度任意字符的文件或目录

[root@centos7 ~]#ll -d /etc/[^[:alpha:]][:alpha:]*

-rw-r--r-- 1 root root 0 Feb 22 20:08 /etc/2a444.log

2、复制/etc目录下所有以p开头,以非数字结尾的文件或目录到/tmp/mytest1目录中。

[root@centos7 ~]#mkdir /tmp/mytest1

[root@centos7 ~]#cp -avr /etc/p*[^0-9] /tmp/mytest1

3、将/etc/issue文件中的内容转换为大写后保存至/tmp/issue.out文件中

[root@centos7 ~]#cat /etc/issue|tr "a-z" "A-Z" >/tmp/issue.out

[root@centos7 ~]#cat /tmp/issue.out

\S

KERNEL \R ON AN \M

4、请总结描述用户和组管理类命令的使用方法并完成以下练习:

(1)、创建组distro,其GID为2019;

[root@centos7 ~]#groupadd distro -g 2019

[root@centos7 ~]#getent group distro

distro:x:2019:

(2)、创建用户mandriva, 其ID号为1005;基本组为distro;

[root@centos7 ~]#useradd mandriva -u 1005 -g distro

[root@centos7 ~]#id mandriva

uid=1005(mandriva) gid=2019(distro) groups=2019(distro)

(3)、创建用户mageia,其ID号为1100,家目录为/homenux;

[root@centos7 ~]#useradd mageia -u 1100 -d /homenux

[root@centos7 ~]#id mageia

uid=1100(mageia) gid=1100(mageia) groups=1100(mageia)

[root@centos7 ~]#ll -a /homenux

total 16

(4)、给用户mageia添加密码,密码为mageedu,并设置用户密码7天后过期

[root@centos7 ~]#getent shadow mageia

mageia:$6$TSa1n5SM$LObRg2T6VWhlLiYcWVKwm5gFURktqK5sMyMSCVsg2UHjG/wUUmfAII59HtXo4rUv2nugNNnmqz7.1NgS/scTX1:18315:0:99999:7:::

[root@centos7 ~]#echo "mageedu"|passwd -x 7 --stdin mageia

Adjusting aging data for user mageia.

passwd: Success

[root@centos7 ~]#getent shadow mageia

mageia:$6$TSa1n5SM$LObRg2T6VWhlLiYcWVKwm5gFURktqK5sMyMSCVsg2UHjG/wUUmfAII59HtXo4rUv2nugNNnmqz7.1NgS/scTX1:18315:0:7:7:::

(5)、删除mandriva,但保留其家目录;

[root@centos7 ~]#getent passwd mandriva

mandriva:x:1005:2019::/home/mandriva:/bin/bash

[root@centos7 ~]#userdel mandriva

[root@centos7 ~]#ls /home

chen  chi  mandriva  rose  rost  slackware

(6)、创建用户slackware,其ID号为2002,基本组为distro,附加组peguin;

[root@centos7 ~]#useradd slackware -u 2002 -g distro -G peguin

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),2020(peguin)

(7)、修改slackware的默认shell为/bin/tcsh;

[root@centos7 ~]#getent passwd slackware

slackware:x:2002:2019::/home/slackware:/bin/bash

[root@centos7 ~]#usermod -s /bin/tcsh slackware

[root@centos7 ~]#getent passwd slackware

slackware:x:2002:2019::/home/slackware:/bin/tcsh

(8)、为用户slackware新增附加组admins

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),2020(peguin)

[root@centos7 ~]#usermod -aG admins slackware

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),1002(admins),2020(peguin)

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),2020(peguin)

[root@centos7 ~]#gpasswd -a slackware admins

Adding user slackware to group admins

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),1002(admins),2020(peguin)

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),2020(peguin)

[root@centos7 ~]#groupmems -a slackware -g admins

[root@centos7 ~]#id slackware

uid=2002(slackware) gid=2019(distro) groups=2019(distro),1002(admins),2020(peguin)

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