Question: I have 100 machines to be automatically controlled using passwordless ssh.
However, since passwordless ssh requires id\_rsa handshaking, it takes some time for controlling a machine as we can see in the following.

```
$ time ssh remote hostname
remote

real    0m0.294s
user    0m0.020s
sys     0m0.000s

```

It takes approximately 0.3 seconds, and doing this all over 100 machines takes around 30 seconds.
What I'm looking for is to make the account on the remote machine no password at all. 
Is there a way to do it?

Answer: 
There is a way: use [telnet](http://en.wikipedia.org/wiki/Telnet). It provides the same as ssh without authentication and encryption.
`You can try using sshpass`

For example, when password is in password.txt file:

`sshpass -fpassword.txt ssh username@hostname`