Unix in a Nutshell, 4th Edition

Name

ssh

Synopsis

    ssh [options] hostname [command]
    slogin [options] hostname [command]

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 better 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 the "Escape characters" section later in this entry 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. Interestingly enough, Solaris, GNU/Linux, and Mac OS X all use OpenSSH . See also scp, sftp, and SSH, The Secure Shell, cited in the Bibliography.

On GNU/Linux and Mac OS X, slogin is a symbolic link to ssh. It is meant to replace the original BSD rlogin command.

URL: http://www.openssh.org.

Options

-1

Try only SSH1.

-2

Try only SSH2.

-4

Use only IPv4 addresses.

-6

Use only IPv6 addresses.

-a

Disable forwarding of the authentication agent connection.

-A

Allow forwarding of the authentication agent connection. Can also be specified on a per-host basis in a configuration file.

-b bind_address

Specify ...