linux shell 学习摘记（7）

《linux shell 脚本编程攻略（第2版）》第七章 “无网不利”笔记

常用命令：ifocnfig, host, nslookup, dhclient, route, ping, fping, nc, lsof, netstat, iwconfig, ssh, sshfs, firewall, &子进程

打印网络接口列表ifconfig | cut -c-10 | tr -d ' ' | tr -s '\n'
提取IP地址ifconfig em1 | grep -E -o "inet addr:[^ ]*" | grep -o "[0-9.]*"
硬件地址欺骗ifconfig em1 hw ether 00:1c:bf:87:25:d5
分配给当前系统的域名服务器cat /etc/resolv.conf
host codeshold.com(/ect/hosts), nslookup codeshold.com
dhclient em1
route add deafult gw IP_ADDRESS INTERFACE_NAME, route add default gw 192.168.0.1 wlan0
ping -c 2 codeshold.com, 列出网上所有活动的主机fping
通过&加速脚本执行速度，并行执行, wait等待所有子进程结束后在退出

#!/bin/bash  
for ip in 10.10.{0..255}.{1..255}  
do   
    (  
        ping $ip -c 3 &> /dev/null;  
        if [ $? -eq 0 ];  
        then  
            echo $ip is alive  
        fi  
    )&  
done  
wait  

fping -a 192.160.1/24 -g, fping -a < ip.list
ESSID(Extended Service Set Identification) iwconfig

#!/bin/bash  
  
IFACE=wlan0  
IP_ADDR=10.10.82.155  
SUBNET_MAST=255.255.255.0  
GW=192.168.1.1  
HW_ADDR="00:1c:bf:87:25:d2"  
  
ESSID="homenet"  
WEP_KEY=8b140b20e7  
FREQ=2.462G  
KEY_PART=""  
  
if [[ -n $WEP_KEY ]];  
then  
    KEY_PART="key $WEP_KEY"  
fi  
  
ifconfig $IFACE down  
  
if [ $UID -ne 0 ];  
then  
    echo "Run as root"  
    exit 1;  
fi  
  
if [[ -n $HW_ADDR ]];  
then  
    ifconfig $IFACE hw ether $HW_ADDR  
    echo Spoofed MAC ADDRESS to $HW_ADDR  
fi  
  
iwconfig $IFACE essid $ESSID $KEY_PART freq $FREQ  
  
ifconfig $IP_ADDR netmask $SUBNET_MASK  
  
route add default gw $GW $IFACE  
  
echo Successfully configured $IFACE  
  

ssh 端口转发
1. ssh -L 8000:www.codeshold.com:80 user@localhost 将本地端口8000的流量转发到www.codeshold.com:80上
2. ssh -fL 8000:www.codeshold.com:80 user@localhost -N, -f后台运行， -N无需执行命令，只进行端口转发
3. 反向端口转发: ssh -R 8000:localhost:80 user@REMOTEMACHINE
在本地挂载远程驱动器
1. sshfs -o allowother user@remotehost:/home/path /mnt/mountpoint
2. umount /mnt/mountpoint
列出本地主机当前的开放端口 lsof -i | grep ":[0-9]\+->" -o | grep "[0-9]\+" -o | sort | uniq
netstat -tnp
创建网络套接字 nc -l 1234, nc HOST 1234; nc -l 1234 > destionationfilename, nc HOST 1234 < sourcefilename
iptables互联网连接共享

#!/bin/bash  
echo 1> /proc/sys/net/ipv4/ip_forward  
iptables -A FORWARD -i $1 -o $2 -s 10.10.0.0/16 -m conntrack --ctstate NEW -j ACCEPT  
iptables -A FORWARD -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT  
iptables -A POSTROUTING -t nat -j MASQUERADE  

读书笔记 7

运维 1

高速网络 2

SDN 4

git 3

vim 6

markdown 1

web 2

shell 13

tools 15

performance 1

security 11

windows 1

python 3

书单 5

note 3

script 1

linux 3

mac 1

leetcode 1

network 13

translation 1

c/c++ 4

算法 2

技术分享 2

docker 2

cloud 1

scala 1

tool 1

database 4

心理学 1

maven 1