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I want to login to a remote system in ubuntu using a script file which will be executed in my system . The script contains the following commands

#!/bin/bash
echo 'systemPwd' | ssh [email protected]

By executing this script I could not log in to the system. It doesn't gets the password from the echo command. But I don't know how to use alternatives.

But I tried this script

#!/bin/bash
sshpass -p 'systemPwd' ssh [email protected] <<-'ENDSSH'
    #commands to run on remote host
    echo 'systemPwd' | sudo -S  shutdown-h now
ENDSSH

In the above script the sshpass has been used. The problem is that sshpass has to be installed first. Anyone suggest an alternative method for this which would make me to connect to remote system without sshpass.

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  • Alternatively you could set up certificate based authentication and avoid having a password stored in your script. Commented Jan 12, 2017 at 13:00
  • Actually the problem is I want to make this method to work in Colibri T20 OS (angstrom Platform OS). So in that OS ,I'm unable to install the ssh-keygen and ssh pass package in that colibri OS. Commented Jan 28, 2017 at 13:01
  • You don't need either of those packages. You just need some way of generating a certificate pair that you can use in the client and server. Commented Jan 28, 2017 at 20:17
  • Yeah You are right. But in case of ubuntu it's working without any package by simply using the command ssh-keygen . But in angstrom os that ssh-keygen is not available. That's the problem in my scenario. Commented Jan 30, 2017 at 7:23
  • So run ssh-keygen on a different machine; all it does is to generate a pair of keys: one for the client and one for the server. Commented Jan 30, 2017 at 10:28

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I recommend you to use SSH Keys.

For creating SSH Keys use this command on the client machine:

ssh-keygen -t rsa

Then you can copy the public key into the new machine's authorized_keys file with the ssh-copy-id command:

ssh-copy-id [email protected]

After that you can login to your remote machine without password.

for more info: https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys--2

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