Re: [Expect] Need to have explanations for the use of the expect command


"Andrew Falanga" <not_real@xxxxxx> wrote in message
news:441862a9$1@xxxxxxxxxxxxxxxxxxxxxx
Ben C wrote:
On 2006-03-15, Andrew Falanga <not_real@xxxxxx> wrote:
Hello,
...
The script is, basically,

#! /usr/bin/expect

set host [lindex $argv 0]

spawn ssh root@$host "cd logs; ls"

expect {
-re password { sleep 1; exp_send "password\r" }
}

Most hosts I've logged into put the "password" line with a capital P.
password doesn't match Password.

Tip: expect -d is very useful for seeing why this kind of thing doesn't
work.

Otherwise I think the script is OK.

Ok, I'm going to paste in the result of using the -d option:

expect version 5.40.0
argv[0] = /usr/bin/expect argv[1] = -d argv[2] = ./exp.expect argv[3]
= remtest1
set argc 1
set argv0 "./exp.expect"
set argv "remtest1"
executing commands from command file ./exp.expect
spawn ssh root@remtest1 cd logs; ls
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {24283}

expect: does "" (spawn_id exp4) match regular expression "password"? no
root@remtest1's password:
expect: does "root@remtest1's password: " (spawn_id exp4) match regular
expression "password"? yes
expect: set expect_out(0,string) "password"
expect: set expect_out(spawn_id) "exp4"
expect: set expect_out(buffer) "root@remtest1's password"
send: sending "utah1\r" to { exp4 }

It is working. You sent the password and it returned whatever is next.
However, you do not have an "expect" statement after the send password.
ALWAYS have a send/expect pair. Otherwise it will timeout, and the default
value is 10 seconds. I suggest buying and reading "Exploring Expect" by Don
Libes. All questions are answered in the book. However, sometimes it takes
a bit of research and understanding to find the answer.


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