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+SSH, or Secure Shell, is a protocol used to securely log onto remote systems.
+>  a program used for logging or executing commands on a remote server.
+
+- connecting to a remote server
+`ssh username@remote_host`
+
+- connecting to a remote server with specific port
+`ssh username@remote_host` -P 2222
+
+- ssh tunneling
+`ssh -D 9999 -C username@remote_host`
+~