ssh

1. Create ssh keypair

   ssh-keygen -t rsa

2. Example config file

   Putting the file below (named config) within the .ssh folder one can connect using ssh server1

   host *
       AddKeysToAgent yes
       ServerAliveInterval 100
       ServerAliveCountMax 2
       ForwardAgent yes
       IdentityFile $HOME/.ssh/myuser/id_rsa
       user myuser
       StrictHostKeyChecking no
       ConnectTimeout 3
   
   host server1
       # here it uses the user myuser
       hostname xxx.xxx.xxx.xxx
   host server2
       IdentityFile $HOME/.ssh/anotheruser/id_rsa
       user anotheruser
       hostname yyy.yyy.yyy.yyy
       
   

scp

1. copy files among remote machines (directly)

   scp [OPTION] [user@]SRC_HOST:]file1 [user@]DEST_HOST:]file2
   

2. same as above but passing through the local machine

   scp [OPTION] -3 [user@]SRC_HOST:]file1 [user@]DEST_HOST:]file2
   

3. source of the 2 items above

4. more