第四周作业

1. 计算 100 以内所有能被 3 整除的整数之和

#vim sum.sh
#！/bin/bash

sum=0
for i in {1..100}; do
        num=`echo $i%3|bc`

        if [ $num -eq 0 ]; then
                let sum+=i && continue 2
        fi

done

echo "The sum is:$sum"

 

 

 

2. 编写脚本，求 100 以内所有正奇数之和

 #vim sum2.sh

#!/bin/bash

sum=0
for i in {1..100}; do
　　num=`echo $i%2|bc`
　　 [ $num -eq 1 ] ; then
　　　　let sum+=i;continue 2
　　fi
done
echo "The sum is:$sum"

 

 

 

3. 随机生成 10 以内的数字，实现猜字游戏，提示比较大或小，相等则退出

 #vim ramdom.sh

read -p 'Please guess the number between 1-10:' NUM

if [ $NUM -gt 10 -o $NUM -lt 0 ]; then
        echo "The false input" ;
        exit 1
fi

if [ $[$RANDOM%10] -gt $NUM ] ; then
        echo "The number is small!"
elif  [ $[$RANDOM%10] -lt $NUM ] ; then
        echo "The number is big!"
else
        echo "Congratulations,you are so smart!"
fi 

 

  

4. 编写函数，实现两个数字做为参数，返回最大值

#vim test.sh

#!/bin/bash

read -p ' Please input the first number: ' num1
read -p " Please input the second number: " num2

#判断输入是否正确

if [[ $num1 =~ [^[0-9]]*$ ]] ; then
　　echo "sorry,false input"
　　exit
elif [[ $num2 =~ [^[0-9]]*$ ]] ;then
　　echo "sorry,false input"
　　exit
fi

#比较大小#

if [ $[$num1] -gt $[$num2] ]; then
　　echo "The bigger number is $num1"
elif [ $[$num1] -lt $[$num2] ] ; then
　　echo "The bigger number is $num2"
else
　　echo "The number is equal."
fi

 

5. 编写一个httpd安装脚本

#vim httpd.sh

#!/bin/bash
NAME=httpd-2.4.43

#安装依赖包
yum install gcc apr-devel apr-util-devel autoconf pcre-devel openssl-devel redhat-rpm-config make tar bzip2 -y 

#切换目录及下载解压缩文件
cd /usr/local/src
wget  http://archive.apache.org/dist/httpd/httpd-2.4.43.tar.bz2 && tar xvf $NAME.tar.bz2
cd $NAME/
./configure --prefix=/apps/httpd --sysconfdir=/etc/httpd --enable-ssl && make && make install

#写入环境变量
echo "PATH=/apps/httpd/bin:$PATH" > /etc/profile.d/httpd.sh
. /etc/profile.d/httpd.sh

#修稿网页内容
sed 's@It works\!@Welcome to my web@' /apps/httpd/htdos/index.html

#启动httpd
apachectl start