Question

I need to be able to return a different password after the first one fails which will be the second time the prompt asks for the same expect value “Password:”

(expect -c "

 #exp_internal 1
  set passwords {PASS1 PASS2}
  set index 0 
  set timeout 20
  # Start the session with the input variable and the rest of the hostname
  spawn telnet $host
  set timeout 3 
  expect {
-ex     \"Password:\" {
            send \"[lindex $passwords $index]\r\"
            incr index  
 exp_continue;
  }
  }

I just can’t get it to work. It looks like there is nothing in the lindex send:

 -ex     "Password:" {
    send "[lindex  ]\r"

Answer 1

The problem is you’re using double quotes to group the expect script — bash is interpreting the $variables as bash variables. You need to either:

1. use single quotes to delimit the script, or
2. escape all the \$expect_variables so bash does not substitute them first.