shell脚本-shell的getops 原

#!/bin/bash
##Find ip or interface
##Written by Adai 2017-09-06
read -p "Input 'i' to interface;'I' to ip: " c
if [[ $c == i ]]
then
    read -p "Please input your interface name: " n
    ip=`ifconfig | egrep -A1 "$n" |egrep -v "$n" |awk '{print $2}'`
    echo "ip is: $ip"
elif [[ $c == I ]]
then
    read -p "Please input your ip:" m
    ens=`ifconfig | egrep -B1 "$m" |egrep -v "$m"|awk -F ":" '{print $1}'`
    echo "interface is: $ens"
else
    echo "Unknown variate.Please check your option!"
fi

#!/bin/bash
ip add |awk -F ":" '$1 ~ /^[1-9]/ {print $2}'|sed 's/ //g' > /tmp/eths.txt
[ -f /tmp/eth_ip.log ] && rm -f /tmp/eth_ip.log
for eth in `cat /tmp/eths.txt`
do
    ip=`ip add |grep -A2 ": $eth" |grep inet |awk '{print $2}' |cut -d '/' -f 1`
    echo "$eth:$ip" >> /tmp/eth_ip.log
done

useage()
{
    echo "Please useage: $0 -i 网卡名字 or $0 -I ip地址"
}

wrong_eth()
{
    if ! grep -q "$1" /tmp/eth_ip.log
    then
        echo "请指定正确的网卡名字"
    exit
    fi
}

wrong_ip()
{
    if ! grep -qw "$1" /tmp/eth_ip.log
    then
        echo "请指定正确的ip地址"
    exit
    fi
}

if [ $# -ne 2 ]
then
    useage
    exit
fi

case $1 in
    -i)
    wrong_eth $2 
    grep $2 /tmp/eth_ip.log |awk -F ':' '{print $2}'
    ;;

    -I)
    wrong_ip $2
    grep $2 /tmp/eth_ip.log |awk -F ':' '{print $1}'
    ;;

    *)
    useage
    exit
esac