Expect Telnet Example

Written by: dimport Published by: dimport Published on: 2003-06-21 07:19:46 Topic: Linux

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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

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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 2009-04-22 14:29:59 While sending so I am unable to send passwords that contain @.Please guide how to send such passwors through Expect. online games Anonymous 2010-01-20 00:33:33 http://www.bagscabin.com/mulberry bags Anonymous 2010-02-24 06:31:14 http://www.certpartners.org Anonymously add a comment: (or register here) (registration is really fast and we send you no spam) BB Code is enabled. Captcha Number: