1 创建4个用户,密码是12345678
检查环境:
[root@laoliu78 ~]# id
uid=0(root) gid=0(root) groups=0(root)
[root@laoliu78 ~]# ifconfig | grep inet | awk 'NR==2 {printf $2}'
192.168.1.10[root@laoliu78 ~]#
[root@laoliu78 ~]# hostname -I
192.168.1.10 192.168.122.1 172.17.0.1
以上检查本机的IP 地址,
更新yum 库数据
ping www.baidu.com [root@laoliu78 ~]# ping www.baidu.com PING www.a.shifen.com (220.181.38.150) 56(84) bytes of data. 64 bytes from 220.181.38.150 (220.181.38.150): icmp_seq=1 ttl=52 time=57.7 ms ^C [root@laoliu78 ~]# yum clean all Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Cleaning repos: base epel extras updates Cleaning up list of fastest mirrors [root@laoliu78 ~]# yum repolist Loaded plugins: fastestmirror, langpacks, product-id, search-disabled-repos, subscription-manager
This system is not registered with an entitlement server. You can use subscription-manager to register.
Determining fastest mirrors epel/x86_64/metalink | 3.7 kB 00:00:00
- base: mirrors.aliyun.com
- epel: mirrors.bfsu.edu.cn
- extras: mirrors.aliyun.com
- updates: mirrors.aliyun.com 国内ali 的yum 镜像源。
root@laoliu78 opt]# useradd test1
[root@laoliu78 opt]# useradd test12
[root@laoliu78 opt]# useradd test123
[root@laoliu78 opt]# useradd test1234 ----- 创建4个用户
[root@laoliu78 opt]# echo 123456 | passwd --stdin test1
Changing password for user test1.
passwd: all authentication tokens updated successfully.
[root@laoliu78 opt]# echo 123456 | passwd --stdin test12
Changing password for user test12.
passwd: all authentication tokens updated successfully.
[root@laoliu78 opt]# echo 123456 | passwd --stdin test123
Changing password for user test123.
passwd: all authentication tokens updated successfully.
[root@laoliu78 opt]# echo 123456 | passwd --stdin test1234
Changing password for user test1234.
passwd: all authentication tokens updated successfully.
[root@laoliu78 opt]# userdel -r test1
[root@laoliu78 opt]# userdel -r test12
[root@laoliu78 opt]# userdel -r test123-----删除3个用户,留下test1234
[root@laoliu78 opt]# id test1234
uid=1006(test1234) gid=1006(test1234) groups=1006(test1234)
[root@laoliu78 opt]# vim /etc/passwd
[root@laoliu78 opt]# id test1234
uid=0(root) gid=0(root) groups=0(root)
作业三 设置永久生效的主机命,为什么是永久的
设置临时用户名为test
[root@urum ~]# hostname test
[root@urum ~]# bash
[root@test ~]# cat /etc/hostname
urum
但是配置文件还是没有改动,主机重启后,恢复原来的urum.
永久修改主机名:
方法一:通过hostnamectl 实现,但是局限是centos 7 以上的版本,
[root@test ~]# hostnamectl set-hostname laoliu78
[root@test ~]#
[root@test ~]# bash
[root@laoliu78 ~]#
方法二:
vim /etc/hostname 此方法需要重启主机,需要重启才能生效
设置临时用户名为test
[root@urum ~]# hostname test
[root@urum ~]# bash
[root@test ~]# cat /etc/hostname
urum
但是配置文件还是没有改动,主机重启后,恢复原来的urum.
永久修改主机名:
方法一:通过hostnamectl 实现,但是局限是centos 7 以上的版本,
[root@test ~]# hostnamectl set-hostname laoliu78
[root@test ~]#
[root@test ~]# bash
[root@laoliu78 ~]#
方法二:
vim /etc/hostname 此方法需要重启主机,需要重启才能生效
购物车脚本
vim tao.sh
#! /bin/bash
echo "请选择需要购买的产品"
echo "1.apple";echo "2.banana";echo "3.pear";echo "4.table"
[root@laoliu78 ~]# bash tao.sh
请选择需要购买的产品
1.apple
2.banana
3.pear
4.table
[root@laoliu78 ~]#