Why is bash script not working?

Question

bash

bash script not working. the script is connected on a telnet drives in a command, but does not carry out it.

#!/bin/bash

for ip in `cat ip.txt`

do

{ echo "admin+t/r"; sleep 2; echo "pass"; sleep 2; echo "ping 192.168.20.35"; sleep 2; echo "quit" ;} | telnet $ip  

done

the script is run on ubuntu.

echo -e "ping 192.168.20.35" doesn't help

Answer 1

why not make it easier?

[email protected]:~ $ ssh [email protected] ping 192.168.109.1
[email protected]'s password:
  SEQ HOST                                     SIZE TTL TIME  STATUS
    0 192.168.109.1                              56  64 0ms
    1 192.168.109.1                              56  64 0ms
    2 192.168.109.1                              56  64 0ms
    3 192.168.109.1                              56  64 0ms

If you throw a key on Mikrotik ssh, then you will not need to enter a password