第四周作业

第四周作业：
1. 计算 100 以内所有能被 3 整除的整数之和

#!/bin/bash
#计算100以内所有能被3整除的正整数的和
#定义和变量
let SUM = 0

for I in {1..100}; do
#取余运算
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
n=0
for i in {1..100};
do
if [ $[$i%2] -eq 1 ]
then
n=$[$n+$i]
fi
done
echo "sum=$n"

　　

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=$[RANDOM%10]
while read -p "输入10以内的数字："INPUT ;do
if [ $INPUT -eq $NUM ] ;then
echo "恭喜你猜对了！"
break
elif [ $INPUT -gt $NUM ];then
echo"数字太大了，重新猜！"
else
echo"数字太小了，重新猜！"
fi
done

4. 编写函数，实现两个数字做为参数，返回最大值

#!/bin/bash
while read -p "please input two number: " n m
do
if (("$n" > "$m"))
then
max=$[$n]
min=$[$m]
echo "max=$max; min=$min"
elif (("$n" < "$m"))
then
max=$[$m]
min=$[$n]
echo "max=$max; min=$min" 
else
echo "two num equal"
fi
done

　　

5. 编写一个httpd安装脚本

#!/bin/bash
aaa=`rpm -qa httpd | wc -l`;
if [ $aaa -eq 1 ] ; then
rpm -e httpd -nodeps;
fi
yum -y install apr* pcre-devel gcc* apr-util-devel apr-util &> /dev/null
if [ ! $? -eq 0 ]; then
rm -rf /etc/yum.repos.d/*
echo "[aaa]
name=CentOS-$releasever - Media
baseurl=ftp://192.168.100.1/163
gpgcheck=0
enabled=1" > /etc/yum.repos.d/aaa.repo
yum clean all
yum -y install apr* pcre-devel gcc* apr-util-devel apr-util &> /dev/null
fi
cd ~
tar zxvf  httpd-*.tar.gz -C /usr/src/ &>/dev/null
cd /usr/src/httpd*
./configure --prefix=/usr/local/httpd --enable-so --enable-rewrite &>/dev/null
make &>/dev/null && make install &>/dev/null
echo "httpd安装成功"
ln -s /usr/local/httpd/bin/* /usr/bin/
cp /usr/local/httpd/bin/apachectl /etc/init.d/httpd
sed -i '2s/#/#chkconfig:35 80 20/' /etc/init.d/httpd
chkconfig --add httpd
chkconfig httpd on
systemctl start httpd
netstat -anpt | grep "httpd"
if [ ! $? -eq 0 ];then
echo "httpd启动失败"
fi
echo "httpd启动成功"