shell编程实战9

#!/bin/bash

ip addr|grep ^[0-9]|awk -F ‘[: ]+‘ ‘{print $2}‘>/tmp/eth.list

##利用死循环来提示用户输入正确的网卡名，输入正确的网卡名后跳出死循环
while :
do
echo "The network card is `cat /tmp/eth.list|xargs`" #多行合并为一行
read -p "请输入网卡名：" x
if [ -z "$x" ]
then
echo "请输入一个网卡名"
continue
fi
if ! grep -qw "$x" /tmp/eth.list
then
echo "输入的网卡名不存在，请输入正确的网卡名"
continue
else
break
fi
done

## 一个网卡一个IP的情况,ip写入变量中
#ip=`ip addr show dev eth0|grep -w "inet"|awk ‘{print $2}‘|awk -F / ‘{print $1}‘`
#echo "The $x ip is $ip"

## 一个网卡多个IP的情况,IP写入文件中
net_ip()
{
ip addr show dev eth0|grep -w "inet"|awk ‘{print $2}‘|awk -F / ‘{print $1}‘ >/tmp/$1.txt
n=`wc -l /tmp/$1.txt|awk ‘{print $1}‘`
if [ $n -eq 0 ]
then
echo "the $1 没有IP"
else
echo "the $1 ip is:"
cat /tmp/$1.txt
fi
}
net_ip $x

#!/bin/bash

if [ $# -ne 2 ]
then
echo "必须输入2个参数,第一个参数为网站，第二参数为目录"
exit 1
fi

if [ ! -d $2 ]
then
while :
do
echo "$2目录不存在，是否创建该目录?(y|n)"
read c
case $c in
y|Y)
mkdir -p $2
break
;;
n|N)
exit 51
;;
*)
echo "请输入y或者n"
continue
;;
esac
done
else
cd $2
wget $1
if [ $? -eq 0 ]
then
exit 0
else
echo "下载失败"
exit 52
fi
fi