From: Jeremy Bopp <jeremy@...>
Date: 2010-10-16T10:15:14+09:00
Subject: Re: How do i provide password for su command while using net/telnet in ruby

On 10/15/2010 1:10 AM, Amit Tomar wrote:
> Jeremy Bopp wrote in post #950260:
>> On 10/14/2010 5:22 AM, Amit Tomar wrote:
>>>    localhost.cmd("cd /home/dvsdkrp/workdir/smruti") { |c| print c }
>>> What should i do??
>> I want to think that the problem here is that the su program expects to
>> have a terminal so that it can disable echoing what you type for your
>> password and then directly read that password.  Driving a telnet session
>> like this does not emulate a terminal and could cause problems for su.
>> I would expect su to error out rather than cause a timeout though.
>>
>> Are you able to configure sudo on that host?  If so you can configure it
>> to allow your account to run the desired command(s) without a password
>> and then invoke sudo instead of su.
>>
>> -Jeremy
> 
> Hi Jeremy
>           You are right this is how i solved it
> 
> su_prompt = "Password: "
> localhost.cmd("String" => "su", "Match" => /#{su_prompt}/) { |c| print 
> }
> localhost.cmd("passwd")
> Now its working fine

Actually, your solution of looking for su's prompt and then sending the
password as a "command" proves that my assertion was mostly incorrect,
but I'm glad you found what you were looking for.

-Jeremy