SSH
How to restrict or allow ssh only from certain users, groups or hosts in Linux
How to allow SSH for root login only from specific host or IP address? How to configure and restrict SSH to permit login only for certain users and/or groups?
5 commands to copy file from one server to another in Linux or Unix
commands to copy file from one server to another in Linux or Unix with examples using sftp scp rsync sshfs nfs. copy using shell script between two machine