How to take password using 'expect' from user ?

try to use the interact command after

expect "password:"

this will turn control to user to enter password

But I am using a for loop to login to more than 100 host, and I will have to type password for all of them.. :)
and also I do not want to keep my password inside the file for security risk.. Can not I assign my password to a variable at run time without echoing on the prompt ??

you may pass password as an argument to the script e.g. argument1, then in the expect script you do

set password [lindex $argv 1]
.
.
expect "password:"
send "$password\r"
expect "password:"
send "$password\r"

I do not want to echo the password on prompt while providing as the argument to expect. Can't I take password like below script ?
It doesn't echo the password entered by user, it takes the input silently.

$ cat test.sh
#!/usr/bin/bash
 
echo Please, enter your Password
read -s pass
echo "your password is $pass"

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You may do like this:

#!/usr/bin/bash
#
echo "Please enter password: "
read password
export password
(call expect script here)

in the expect script, put

expect "password:"
send "env(password)\r"
expect "password:"
send "env(password)\r"

Not exactly what you were asking for, but you may consider using ssh passwordless keys instead of just passwords.
As you wrote something about 100 hosts, it's probably some administration task you want to automate. Take a look at dsh (distributed shell) and Cluster SSH.

$cat /home/balbirs/script/bssh.sh


#!/bin/bash

echo -n "(this is bssh script talking)"
read -s pass
export password=$pass
/home/balbirs/script/expect.sh $password $1



$cat /home/balbirs/script/expect.sh



#!/usr/bin/expect -f
set timeout 9
set PASS [lindex $argv 0]
set SCRIPT [lindex $argv 1]

spawn "$SCRIPT"
match_max 100000
expect "yes/no" {send "yes\r"}
expect "password:"
send "$PASS\r"
expect "password:"
send "$PASS\r"
expect "password:"
send "$PASS\r"
expect eof
============================================


$ cat /tmp/2
for i in host1 host2 host3
do
scp /tmp/123 $i:/tmp
done


Now I am running a command like these
$bssh.sh /tmp/2

and it is working fine but for 3 host I had to mention "expect "password:" 3 times,
How can I make it(expect.sh) dynamic if I have to use 100+ host ?

you may expect different prompts and send different responses. e.g. you expect 2 times password: prompt and response by password value. for the 3rd expect you may do like:

expect "password:"  { send "$PASS\r" } \
      "$"   { send "exit\r" }

The $ might be replaced with system prompt like #

I have 100+ host list with the "password:" expect, it is getting exited after third expect login only..
How can I make expect to match "password:" 100+ times ?

I could not understand what you mean by "make expect to match "password:" 100+ times"

logic should be

shell script to loop for 100+ hosts that calls expect script for each host, and each time expect should change the password

Hi Omar,

My concern is if I every time recall the expect script then I will have to provide 100 times password manually which would ultimately pass the password to my ssh client asking for password, So i am making expect to handle it, like give my password only once and provide(pass) it to any expect with 'password:' irrespective of there number of match.

Thank you.

is it the same password on all the servers?

yes :)

OK, here the skeleton:

#!/usr/bin/bash
#
echo "Please enter password: "
read password
export password
for host in host1 host2 host3 host4 # till host100
do
   /path/to/expectscript
done

The expect script then should do

set HOST env(host)
set PASS env(password)
spawn ssh $HOST
(rest of expect script)
 spawn ssh

ignore last line in last posting

Thanks Omar, It works fine with me! Appreciate your spoon feeding unexpected help in expect :)

Welcome, I hope you can customize it to meet your requirement.

Thanks a lot Omar! :)