Question

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Using expect to pass a password to ssh

I want to have ssh connection to a remote machine and instead of using ssh command along with the machine address and password, I just want to write a little function that executes the ssh command to the machine and enters the pass after the server asks it. I can write the ssh part but how can I make the script that enters also the pass when the host ask for it?

Answer 1

You may use expect script. You can pass arguments from cmd line. Sample code I write:

#!/usr/bin/expect

set timeout 100
set host [lindex $argv 0]
set username [lindex $argv 1]
set password [lindex $argv 2]
set command [lindex $argv 3]

spawn ssh $username@$host $command
#puts $command
expect {
    "(yes/no)?"
        {
            send "yes\n"
            expect "*assword:" { send "$password\n"}
        }
    "*assword:"
        {
            send "$password\n"
        }
    }