How to ssh or scp without password?

 

Method 1: Use SSH Key-Based Authentication

The most secure and recommended way is to set up SSH key-based authentication, which doesn't require you to include a password in the command.

1. Generate SSH Key Pair (if you don’t have one already):

    ssh-keygen -t rsa -b 4096

Save the key in the default location (~/.ssh/id_rsa).

2. Copy Public Key to the Remote Machine:

ssh-copy-id username@remote_host -p 22

Replace username and remote_host with your remote machine's username and IP address or hostname.

3. Run rsync without Password or ssh into another machine without Password:

rsync -avz /path/to/source/ username@remote_host:/path/to/destination/

ssh username@remote_host -p 22

4. Change folder permission on destination folder.

sudo chmod -R 777 destination_folder