Linux下三种方式实现自动Telnet

一、Shell实现，文件名：autotelnet.sh，代码如下：

(sleep 1;echo "root";sleep 1;echo "123456";sleep 1;echo "en";sleep 1;echo "1qazse4";sleep 1;echo "conf t";sleep 1;echo "int fa0/1";sleep 1;echo "switchport mode multi";sleep 1;echo "end";sleep 1;echo "exit") | telnet 10.32.17.10

二、Expect来实现，文件名：autotelnet.exp，代码如下：

#!/usr/bin/expect

set timeout 100
set TERM xterm
set SERVER "10.32.17.10"
set USER "root"
set PASSWD "123456"

spawn telnet
expect "telnet> "
send "open $SERVER "
expect "Username:"
send "$USER "
expect "Password:"
send "$PASSWD "
expect "longjiang-zero>"
send "en "
expect "Password:"
send "$PASSWD "
expect "longjiang-zero#"
send "conf t "
expect "longjiang-zero(config)#"
send "int fa0/1 "
expect "longjiang-zero(config-if)#"
send "switchport mode multi "
expect "longjiang-zero(config-if)#"
send "end "
expect "longjiang-zero#"
send "exit "

interact

三、Python来实现，文件名：autotelnet.py，代码如下：

#!/usr/bin/python

import telnetlib

host = '10.32.17.10'
user = 'root'
password = '123456'
commands = ['en',password,'conf t','int fa0/1','switchport mode multi','end']

tn = telnetlib.Telnet(host)

tn.read_until("Username:")
tn.write(user + " ")
tn.read_until("Password:")
tn.write(password + " ")

for command in commands:
    tn.write(command+' ')

tn.write("exit ")

print tn.read_all()
print 'Finish!'

具体环境不做介绍。