第四周做業

1. 計算 100 之內全部能被 3 整除的整數之和

  #!/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. 編寫腳本，求 100 之內全部正奇數之和

  #!/bin/bash
  #求100之內的奇數和

echo 計算出1-100的奇數之和 sum=0 for i in $(seq 1 2 100) do let sum+=i done echo $sum 

  

3. 隨機生成 10 之內的數字，實現猜字遊戲，提示比較大或小，相等則退出

#!/bin/bash
#隨機生成10之內的數字，實現猜字遊戲

read -p "請輸入一個10之內數字: " NU
if [ $NU -gt $[$RANDOM%10] ];then

echo "數字比較大"
elif [ $NU -eq $[$RANDOM%10] ];then
exit
elif [ $NU -lt $[$RANDOM%10] ];then
echo "數字過小了"
fi

 

4. 編寫函數，實現兩個數字作爲參數，返回最大值

 #!/bin/bash

 # 比較兩個數大小，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. 編寫一個httpd安裝腳本

#!/bin/bash
#一鍵安裝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

#下載httpd源碼包
curl -o /opt/httpd-2.4.43.tar.bz2 https://mirror.bit.edu.cn/apache/httpd/httpd-2.4.43.tar.bz2
ls /opt
#安裝解壓賴包
yum -y install bzip2

#安裝httpd依賴包
yum install -y gcc make apr-devel apr-util-devel pcre-devel openssl-devel redhat-rpm-config

#建立apache用戶
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