echo-写入与交互界面-linux

#!/bin/bash

# date:2019-03-19

#Author:GuoRi

a=`ifconfig |grep -w inet|awk 'NR==1{print$2}'`

b=hostname

echo "$a $b" >> /etc/hosts

--------------------赛选出本机IP------------

ifconfig |grep -w inet|awk 'NR==1{print$2}'

赛选出本机IP

ifconfig |grep -w inet

完全匹配inet的信息

|awk '{print$2}'

过滤2列

'NR==1

选择第一个IP

---------------------------------------------------------

a=`ifconfig |grep -w inet|awk 'NR==1{print$2}'`

给a赋值：本机IP

echo "$a"

打印a

echo "$a $b" >> /etc/hosts

将a和b的值写入文件

---------------------------------------------------------------

sed -i '7s/enforcing/disabled/g' /etc/selinux/config

替换第7行代码

/enforcing/disabled/

被替换与替换的字符

------------------------------------------

  -e多重匹配

sed -i -e '7s/disabled/enforcing/g' -e  /etc/selinux/config ''

^ 行首

timedatectl list-timezones|grep shang

设置时区位上海

sed -i '8s/^/server controllwe iburst/g' /etc/con

=================================================

-------------------------完整代码-------------

#!/bin/bash

# date:2019-03-19

#Author:GuoRui

#配置域名映射

echo "配置域名映射"

a=`ifconfig |grep -w inet|awk 'NR==1{print$2}'`

b=`hostname`

echo "$a $b" >> /etc/hosts

sed -i '7s/enforcing/disabled/g' /etc/selinux/config

iptables -F

iptables -X

iptables -Z

/usr/sbin/iptables-save

yum install -y chronyd

systemctl restart chronyd

systemctl enable chronyd

chronyc sources

=======================echo交互界面==修改数据库密码========================

#!/bin/bash

(

echo "000000"

eleep 3

echo "y"

seleep 10

echo "123456"

seleep 3

echo "123456"

seleep 3

echo "y"

seleep 3

echo "n"

seleep 3

echo "y"

seleep 3

echo "y"

seleep 3

)|mysql_secure_installation

seleep 3===>代表上一条命令成功后等待3秒后执行下一条命令