一、判断语句
1、if……then……if语句

#!/bin/bash
read -p "请输入y/n:" ym
if [ "$ym" == "Y" -o "$ym" == "y" ]; then
        echo "你输入的是Y"
        exit 0
elif [ "$ym" == "N" -o "$ym" == "n" ]; then
        echo "你输入的是N"
        exit 0
else
        echo "你输入的不是N或者Y"
fi

note：if附近很多空格，全部用空格隔开

2、case……esac语句

#!/bin/bash
read -p "请输入（Y/n）:" fei
case $fei in
y)
        echo '您输入的是y'
        ;;
Y)
        echo '您输入的是Y'
        ;;
n)
        echo '您输入的是n'
        ;;
N)
        echo '您输入的是N'
        ;;
*)
        echo '您输入的不符合要求'
        ;;
esac

二、循环语句
1、while语句

#!/bin/bash
s=0
i=0
while [ "$i" != 100 ]
do
        i=$(($i+1))
        s=$(($s+$i))
done
echo "the result of '1+2+……+100' is $s"

2、until语句

#!/bin/bash
until [ "$yn" == "yes" -o "$yn" == "YES" ]
do
        read -p "Please input yes/YES to stop this program: " yn
done
echo "OK! you input the correct answer."

note：当until满足是进入循环，和while相反

3、for…do…done语句

#举例一
#!/bin/bash
for var in xi fen fei
do
        echo "this is ${var} "
done

#举例二
#!/bin/bash
filelist=$(ls -la)
for var in v$filelist
do
        echo "${var}"
done

#举例三
#!/bin/bash
s=0
for i in $(seq 1 100)
do
        s=$(($s+$i))
done
echo "the result of '1+2+……+100' is $s"

#举例四
#!/bin/bash
echo "请输入从1开始累加到N的值："
read nu
s=0
for((i=1;i<=$nu;i=i+1))
do
        s=$(($s+$i))
done
echo "1+……+$nu is ==>$s"

一、网络配置
1、配置静态ip地址
1）修改/etc/network/interfaces文件（eth0）
iface eth1 inet static
address 192.168.0.101
netmask 255.255.255.0
network 192.168.0.0
broadcask 192.168.0.255
gateway 192.168.0.2
2）重启网卡
/etc/init.d/networking restart 或者
$ sudo ifdown eth0
$ sudo ifup eth0
3）命令设置
sudo ifconfig eth0 192.168.0.190 netmask 255.255.255.0 （ip地址）
sudo route add default gw 192.168.0.1 （网关）
2、动态获取ip地址
sudo dhclient eth0
3、DNS信息
修改/etc/resolv.conf 文件
nameserver DNS的地址1

二、ssh配置
1、安装ssh
sudo apt-get install ssh
2、重启/开启ssh
sudo /etc/init.d/ssh start/restart
3、查看开启情况
netstat -tlp