Python uses pexpect for automated interaction examples

Pexpect is a Python module used to start subroutines and automatically control them, which can be used to interact with command-line programs like SSH, FTP, passwd, Telnet, and so on.

Shell command expect using http://blog.51cto.com/superleedo/1931418

Installing Pexpect

Open https://pypi.org/project/pexpect/#files

Download wget https://files.pythonhosted.org/packages/09/0e/ 75f0c093654988b8f17416afb80f7621bcf7d36bbd6afb4f823acdb4bcdc/pexpect-4.5.0.tar.gz

Tar zxf pexpect-4.5.0.tar.gz

CD pexpect-4.5.0/

Python setup.py Install

SSH telnet, execute command ' LS-LH ' example after successful login

#!/usr/bin/env python
#-*-Coding:utf-8-*-
Import Pexpect
Import Sys
#通过spawn类启动和控制子应用程序
Child = Pexpect.spawn (' ssh [email protected] ')
#将pexpect的输入输出信息写到mylog. txt files
Fout = File (' Mylog.txt ', ' W ')
Child.logfile = Fout
#将pexpect的输入输出信息输出到标准输出
#child. LogFile = sys.stdout
#expect方法用来判断子程序产生的输出 to determine if the corresponding string is matched
Child.expect (' Password: ')
#字符串匹配则使用sendline进行回应-----Send: Send command, do not enter, Sendline: Send command, enter, Sendcontrol: Send control, such as: Sendctrol (' C ') equivalent to ' CTRL + C ', Sendeof: Send EOF
Child.sendline (' 123456 ')
Child.expect (' # ')
Child.sendline (' Ls-lh ')
Child.expect (' # ')

SSH login can also be implemented using Pexpect's Run function

Pexpect.run (' ssh [email protected] ', events={' password: ', ' 123456 '})

For SSH remote login, Pexpect also derived the Pxssh class, in the SSH session operation on another layer of encapsulation

From Pexpect import pxssh
Import Getpass

Try
s = pxssh.pxssh () #创建pxssh对象
hostname = raw_input (' hostname: ')
Username = raw_input (' username: ')
Password = getpass.getpass (' Password: ') #接收密码输入
S.login (Server=hostname,username=username,password=password) #建立ssh连接
S.sendline (' uptime ') #运行uptime命令
S.prompt () #匹配系统提示符
Print S.before #打印出现系统提示符前的命令输出
S.sendline (' Ls-lh ') #运行命令
S.prompt () #匹配系统提示符
Print S.before #打印出现系统提示符前的命令输出
S.sendline (' df-h ') #运行命令
S.prompt () #匹配系统提示符
Print S.before #打印出现系统提示符前的命令输出
S.logout () #断开ssh连接
Except Pxssh. Exceptionpxssh as E:
print ' Pxssh failed on login '
Print str (e)

Automated FTP Example

#!/usr/bin/env python
#-*-Coding:utf-8-*-

Form __future__ Import unicode_literals# using Unicode encoding
Import Pexpect
Import Sys

Child=pexpect.spawnu (' ftp ftp.openbsd.org ')
Child.expect (' (? i) name. *: ') # (? i) Ignore case
Child.sendline (' anonymous ')
Child.expect (' (? i) password ')
Child.sendline (' mima123456 ')
Child.expect (' ftp> ')
Child.sendline (' bin ') #开启二进制传输
Child.expect (' ftp> ')
Child.sendline (' Get Test.txt ')
Child.expect (' ftp> ')
Sys.stdout.write (Child.before)
Print ("Escape character is ' ^] '. \ n")
Sys.stdout.write (Child.after)
Sys.stdout.flush ()
Child.interact ()
Child.sendline (' Bye ')
Child.close ()

remote file package and download sample

#!/usr/bin/env python 
 #-*-coding:utf-8-*-
 
 Import pexpect 
 Import SYS 
 
 ip= "192.168.1.124" 
 user= "root" 
 passwd= "kkl123456" 
 target_file= "/data/logs/nginx.log" 
 
 Child=pexpect.spawn ('/usr/bin/ssh ', [user+ ' @ ' +ip]) 
 Fout=file (' Mylog.txt ', ' W ') 
 Child.logfile=fout 
 
 Try: 
 Child.expect (' (? i) password ') 
 Child.sendline (passwd) 
 Child.expect (' # ') 
 Child.sendline (' Tar -zcf/data/logs/nginx.tar.gz ' +target_file) 
 Child.expect (' # ') 
 Print Child.before 
 child.sendline (' exit ') 
 Fout.close () 
 except EOF: 
 print "expect EOF" 
 except TIMEOUT: 
 print "expect TIMEOUT" 
 
 child= Pexpect.spawn ('/USR/BIN/SCP ', [user+ ' @ ' +ip+ ':/data/logs/nginx.tar.gz ', '/Home ']) 
 Fout=file (' mylog.txt ', ' a ') 
 Child.logfile=fout 
 
 Try: 
 Child.expect (' (? i) password ') 
 Child.sendline (passwd) 
 Child.expect ( Pexpect. EOF) 
 except EOF: 
 print "expect EOF" 
 except TIMEOUT: 
 print "expect TIMEOUT" 
 
 

Python uses pexpect for automated interaction examples