N46期第四周作业

1. 计算 100 以内所有能被 3 整除的整数之和 

sum=0;for((i=0;i<=100;i++));do [ $[$i%3] -eq 0 ] && ((sum=$sum+$i));done;echo $sum

2. 编写脚本，求 100 以内所有正奇数的之和
1.
#!/bin/bash
sum=0
for i in `seq 100`
do
if [ $[$i%2] -ne 0 ];then
sum=$[$sum+$i]
fi
done
echo $sum

2.
#!/bin/bash
sum=0
for i in `seq 1 2 100`
do
sum=$[$sum+$i]
done
echo $sum

3.

#!/bin/bash

echo `seq 1 2 100`|tr -t " " "+"|bc

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
num=`echo $[$RANDOM%10]`

while :;
do
read -p "请输入10以内的数字：" input
if [ $num -eq $input ];then
break
elif [ $num -gt $input ];then
echo "猜的数字小了"
else
echo "猜的数字大了"
fi
done

4. 编写函数，实现两个数字做为参数，返回最大值

GET_max(){
if [ $1 -gt $2 ];then
echo "最大值是$1"
else
echo "最大值是$2"
fi
}

5. 编写一个httpd安装脚本

#!/bin/bash
colour="echo -e \033[1;32m"
end="\033[0m"
cpu=`lscpu|sed -n '/^CPU(s)/p'|tr -s " "|cut -d " " -f2`
$colour 安装httpd $end
yum install apr-devel apr-util-devel pcre-devel openssl-devel -y &> fail-1.log
if [[ $? =~ 0 ]];then 
$colour 相关组件安装完成 $end
cd /usr/local/src/
$colour 开始下载安装文件 $end
wget https://mirrors.tuna.tsinghua.edu.cn/apache//httpd/httpd-2.4.43.tar.bz2 &> /dev/null
tar -xf httpd-2.4.43.tar.bz2
cd httpd-2.4.43/
./configure --prefix=/usr/local/httpd --sysconfdir=/etc/httpd --enable-ssl &> fail-2.log
if [[ $? =~ 0 ]];then
$colour ./configure 完成 $end
make -j $cpu &>fail-3.log
if [[ $? =~ 0 ]];then
$colour make 完成 $end
make install &> fail-4.log
if [[ $? =~ 0 ]];then
$colour make install 完成 $end
echo "PATH=$PATH:/usr/local/httpd/bin" > /etc/profile.d/httpd.sh
source /etc/profile.d/httpd.sh
useradd -r -s /sbin/nologin -d /usr/local/httpd apache
cd /etc/httpd/
cp httpd.conf httpd.conf.bak
sed -i "s#daemon#apache#g" /etc/httpd/httpd.conf
echo "安装完成"

else 
$colour make install 完成 $end
fi
else
$colour make 失败，请检查 $end
fi
else
$colour ./configure 失败 $end
fi
else
$colour 组件安装失败，请检查 $end
fi