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Article viewer

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 134373 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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Blogs: (People who have posted blogs on this subject..)
bb
start svn on system boot in debian on Tue 21st Jul 10am
http://linux.justinhartman.com/Startup_S cript_for_Subversion I found this a really simple explanation of how to start svn when the server boots
bb
SSHFS: Super Easy File Access over SSH on Wed 18th Feb 1pm
This was really useful, and worked great to communicate between servers. http://www.linuxjournal.com/article/8904 Thanks to gabbs
bb
hellanzb nzb news downloader for NSLU2 on Tue 22nd May 7pm
Someone introduced me to the joyful NZB file recently. Its truly a wonderful invention, and allows my to explore usenet binary grabbing using my NSLU2. as previous nntp readers id tried made the process too painful. So simply .... 1) apt-get inst
bb
edna mp3 streaming for nslu2 on Wed 9th May 11am
I've been streaming music from my home NSLU2 server for a while now using mt-daapd (firefly) which is an ITunes server for linux. I can connect to my home network from work using ITunes and a little daap proxy app called rendevous. My friend was doing
ketan404
my blog on Thu 9th Nov 6am
http://ketan404.blogspot.com
bb
Tweaking Apache and Mysql for Low Memory on Fri 20th Oct 11am
i implemented this to tweak my apache/mysql for better performance on my NSLU2. Hard to tell if its helping much though ;-) Mysql really doesnt run too well with apache on NSLU2 so I dont use it for much. http://www.unixshell.com/wiki/index.php/ Optimiz
bb
Article on building rtorrent for arm5vtel NSLU2 with debianslug on Thu 19th Oct 7am
I wrote an article today on my efforts at compiling rtorrent for debianslug. its here ... Article on building rtorrent/libtorrent for arm5vtel NSLU2 with littleendian debianslug
bb
How to mount .iso file on NSLU2 running debianslug on Tue 19th Sep 12pm
If like me your running debianslug on an NSLU2 and you'd like to mount an iso file so it can be directly streamed to Xbox Media Centre (its a beautiful solution isnt it!) then simply do the following. Ensure you have loop support in your debianslug k
bb
TorrentFlux on NSLU2 DebianSlug on Wed 23rd Aug 5am
I installed torrentflux on my NSLU2 over the weekend - mainly because of some frustrations with rtorrent. rtorrent is a superb client (in spite of rakshasa's relucatance to include encryption support inline with azureus and utorrent) and version 0.6.0
bb
Serving ITunes on your home NSLU2 to you remotely on Tue 15th Aug 9am
This presumes that you have mt-daapd running on your NSLU2 and have port forwarding setup on your router to forward port 3689 onto your SLUG ip within your local LAN. Download Rendezvous Proxy. Install and start Rendevous Proxy. Enter your home IP

Test Yourself: (why not try testing your skill on this subject? Clicking the link will start the test.)
Linux Test Simple by a13x4nd7u

This is a simple Linux commands test.
Linux Quiz by abhijangda

Trivia about your favorite OS
Linux Administration by typedeaF

Testing your knowledge of Linux administration tools, very light shell scripting, and good high level understanding of how the OS works at the user level. Anyone who has worked with Linux for 1-3 years should do good.
Linux Commands (Part 1) by nirus

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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