Tired because of typing long password and difficult password when using ssh then try this

1. First create and public key and private key pair using

ssh-keygen -t dsa

2. Then copy the file to every machine you want to ssh without specifying password

scp ~/.ssh/id_dsa.pub user@remote_machine:~user/.ssh/authorized_keys

Easy huh

Also now you can executing command without logging into the system. just do

ssh user@remote_machine “REPLACE THIS WITH ACTUAL COMMAND”