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Expect Telnet Example



Written by:dimport
Published by:dimport
Published on:2003-06-21 07:19:46
Topic:Linux
Search OSI about Linux.More articles by dimport.
 viewed 124722 times send this article printer friendly

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Expect is a great scripting language developed by Don Libes, makes boring interaction so much easier. This is a nice telnet example, well commented.


#!/usr/bin/expect #Where the script should be run from.


set timeout 20 #If it all goes pear shaped the script will timeout after 20 seconds.

set name [lindex $argv 0] #First argument is assigned to the variable name

set user [lindex $argv 1] #Second argument is assigned to the variable user

set password [lindex $argv 2] #Third argument is assigned to the variable password


spawn telnet $name #This spawns the telnet program and connects it to the variable name


expect "login:" #The script expects login

send "$user " #The script sends the user variable

expect "Password:" #The script expects Password

send "$password " #The script sends the password variable

interact #This hands control of the keyboard over two you (Nice expect feature!)


This article was originally written by Sliptop

Did you like this article? There are hundreds more.

Comments:
Anonymous
2006-04-24 07:09:19
But while sending so I am unable to send passwords that contain @.Please guide how to send such passwors through Expect.

Anonymous
2007-01-15 20:41:23
Try using the escape character / before the @ symbol. Alternatively, put the password in quotes.
Anonymous
2007-02-20 10:07:52
You need to add \r at the end of username and password - Leela
Anonymous
2008-05-16 06:14:43
Here's a working example, which logs into the Houston server, which is running Windows 2003 Server, from a laptop running MacOS 10.5:

#!/usr/bin/expect
spawn telnet -l Administrator houston.fubar.com 2368
expect "password: "
send "a1am0\r\n"
interact

Just save into a file, chmod 700, and you're good to go.
Anonymous
2008-06-24 15:08:56
Is this an example, it made it more fuzzier to me
Anonymous
2008-08-15 21:29:54
I need to logon a legacy system ,needs a break after Escape char; so I send brk it prompts with an ? . If I put this it does not work:
expect "Escape"
send "^]\r"
send "send brk\r"
expect "?"
send "login"

and it gets stuck , any advise ?
Anonymous
2008-09-29 18:39:06
you need to "expect" after every "send". So, combine the two sends, or expect a ">" after you escape back to the telnet prompt.
Anonymous
2010-02-24 06:31:14
http://www.certpartners.org
ObatAsamUrat
2011-06-16 07:21:08
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obat asam urat
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Blogs: (People who have posted blogs on this subject..)
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ketan404
my blog on Thu 9th Nov 6am
http://ketan404.blogspot.com
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Test Yourself: (why not try testing your skill on this subject? Clicking the link will start the test.)
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If you think you know the linux command-line then this test is for you. For reference purposes, it is based on Debian/GNU Linux with a BASH Shell.


     
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