第4周作业

1. 计算 100 以内所有能被 3 整除的整数之和

  #!/bin/bash

   sum=0

for i in {1..100}; do

   if [ $[$i%3] -eq 0 ]; then
      sum=$[$sum+$i]
        fi
done
echo "sum=$sum"  

2. 编写脚本，求 100 以内所有正奇数之和

  #!/bin/bash
  #求100以内的奇数和

echo 计算出1-100的奇数之和
sum=0
for i in $(seq 1 2 100)
do
let sum+=i
done
echo $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

#!/bin/bash
#随机生成10以内的数字，实现猜字游戏

read -p "请输入一个10以内数字: " NU
if [ $NU -gt $[$RANDOM%10] ];then

echo "数字比较大"
elif [ $NU -eq $[$RANDOM%10] ];then
exit
elif [ $NU -lt $[$RANDOM%10] ];then
echo "数字太小了"
fi

 

4. 编写函数，实现两个数字做为参数，返回最大值

 #!/bin/bash

 # 比较两个数大小，返回最大值

max_num () {

 if [ $1 -gt $2 ];then

echo "Max is $1"
else
echo "Max is $2"
fi
}
max_num $*

5. 编写一个httpd安装脚本

#!/bin/bash
#一键安装httpd

#配置yum源和epel源
rm -rf /etc/yum.repos.d/*
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean al
yum makecache
yum repolist

#下载httpd源码包
curl -o /opt/httpd-2.4.43.tar.bz2 https://mirror.bit.edu.cn/apache/httpd/httpd-2.4.43.tar.bz2
ls /opt
#安装解压赖包
yum -y install bzip2

#安装httpd依赖包
yum install -y gcc make apr-devel apr-util-devel pcre-devel openssl-devel redhat-rpm-config

#创建apache用户
useradd -r -u 48 -s /sbin/nologin -c "Apache" -d /var/www/ apache

cd /opt/  && tar -xjvf httpd-2.4.43.tar.bz2  -C /usr/local

cd /usr/local

./configure --prefix=/usr/local/httpd --sysconfdir=/etc/httpd --enable-ssl
make && make install

if [ $? -eq 0 ] ;then echo "httpd installed successful!"
fi