Passwordless SSH Login with SSH Keys. Setting up SSH key login so you can connect without typing a password, with the file permissions SSH needs and the safer ssh-copy-id method.
Fixing Amazon AWS SSH Permission Denied Errors. Why SSH to an AWS EC2 Linux instance fails with Permission denied, and how to fix it with the right .pem file permissions and login user name.
Rsync over SSH and the Trailing Slash Question. Copying folders between servers with rsync over SSH, using a custom port and key, and how a trailing slash on the source changes where files end up.