OpenSSH SSH client (remote login program)

-D [bind_address:]port
        Specifies a local “dynamic” application-level port forwarding.  This works by allocating a socket
        to listen to port on the local side, optionally bound to the specified bind_address.  Whenever a
        connection is made to this port, the connection is forwarded over the secure channel, and the
        application protocol is then used to determine where to connect to from the remote machine.
        Currently the SOCKS4 and SOCKS5 protocols are supported, and ssh will act as a SOCKS server.  Only
        root can forward privileged ports.  Dynamic port forwardings can also be specified in the
        configuration file.

        IPv6 addresses can be specified by enclosing the address in square brackets.  Only the superuser
        can forward privileged ports.  By default, the local port is bound in accordance with the
        GatewayPorts setting.  However, an explicit bind_address may be used to bind the connection to a
        specific address.  The bind_address of “localhost” indicates that the listening port be bound for
        local use only, while an empty address or ‘*’ indicates that the port should be available from all
        interfaces.

-C      Requests compression of all data (including stdin, stdout, stderr, and data for forwarded X11 and
        TCP connections).  The compression algorithm is the same used by gzip(1), and the “level” can be
        controlled by the CompressionLevel option for protocol version 1.  Compression is desirable on
        modem lines and other slow connections, but will only slow down things on fast networks.  The
        default value can be set on a host-by-host basis in the configuration files; see the Compression
        option.

-N      Do not execute a remote command.  This is useful for just forwarding ports (protocol version 2
        only).

-A      Enables forwarding of the authentication agent connection.  This can also be specified on a per-
        host basis in a configuration file.

        Agent forwarding should be enabled with caution.  Users with the ability to bypass file permissions
        on the remote host (for the agent's UNIX-domain socket) can access the local agent through the
        forwarded connection.  An attacker cannot obtain key material from the agent, however they can
        perform operations on the keys that enable them to authenticate using the identities loaded into
        the agent.

ssh connects and logs into the specified hostname (with optional user name).  The user must prove his/her
identity to the remote machine using one of several methods depending on the protocol version used (see
below).

If command is specified, it is executed on the remote host instead of a login shell.