Unix commands

1. To copy to a different server with different username 

   (assumption ssh keys are already shared)

   scp /path/to/source-file username@rem-server:/path/to/destination

2. To create a file and make an entry in single line 

   echo secret >> filename.txt

3. To execute a command in remote server via ssh

   ssh user@server "command1 options;command2 options"