#!/usr/bin/expect -f

set timeout 5

set load_fh [open "iplist.txt" r]
set ip_list [split [read $load_fh] "\n"]
close $load_fh

# router user name
set name "admin"

# router password
set pass "PASSWORD"

# Read command as arg to this script
set routercmd [lindex $argv 0]

foreach ip $ip_list {
        if {$ip != ""} {
                send_user "telnet to this host: $ip\n"

                # Connect
                spawn telnet $ip

                # router user name
                set name "admin"

                # router password
                set pass "PASSWORD"

                # Read command as arg to this script
                set routercmd [lindex $argv 0]

                # send username & password
                expect {Login:} {
                send -- "$name\r"
                } {Unable to connect to remote host} {
                send_user -- $expect_out(buffer)
                exp_close
                continue
                } timeout {
                send_user "$ip: timeout"
                exp_close
                continue
                } eof {
                send_user "$ip: close connection"
                continue
              }

                expect "Password:"
                send -- "$pass\r"

                # expect one of these strings and take an action depending which one comes
                # replace "Login incorrect" with whatever message your router sends
                expect {
                    "Do you want to spawn a shell instead?" {
                        send "y\n"

                        # execute command , supposed we r using ash at aztech router
                        expect "# "
                        send -- "$routercmd\r"
                    }
                    "Login incorrect" {
                        puts "Login to $ip failed!"
                    }
                }
                send_user "end processing host: $ip\n\n"
                # close the child process
                exp_close
        }
}