Securely log a user into a remote system and run commands on that system. The version of ssh described here is the OpenSSH client. ssh can use either version 1 (SSH1) or version 2 (SSH2) of the SSH protocol. SSH2 is preferable, as it provides stronger encryption methods and greater connection integrity. The hostname can be specified either as hostname or as user@hostname. If a command is specified, the user is authenticated, the command is executed, and the connection is closed. Otherwise, a terminal session is opened on the remote system. See Escape characters, later in this command, for functions that can be supported through an escape character. The default escape character is a tilde (˜). The exit status returned from ssh is the exit status from the remote system, or 255 if there was an error.
Commonly, authentication is handled with standard username/password credentials, but it can also be useful to authenticate with a key exchange. This is done by generating a key on the client with ssh-keygen and populating the authorized_keys file on the remote host.
Try only SSH1.
Try only SSH2.
Use only IPv4 addresses.
Use only IPv6 addresses.
Disable forwarding of the authentication agent connection.
Allow forwarding of the authentication agent connection. Can also be specified on a per-host basis in a configuration file.
Specify the interface to transmit from when there are multiple available interfaces or aliased ...