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The remote shell (rsh) is a command-line computer program that can execute shell commands as another user, and on another computer across a computer network. The remote system to which rsh connects runs the rsh daemon (rshd). The daemon typically uses the well-known Transmission Control Protocol (TCP) port number 513.
rsh opens a shell on a remote computer without a login procedure. Once connected, the user can execute commands on the remote computer through the shell's command-line interface. rsh passes input and output through the standard streams, and it sends standard output to the user's console.
SSH was designed for Unix-like operating systems as a replacement for Telnet and unsecured remote Unix shell protocols, such as the Berkeley Remote Shell (rsh) and the related rlogin and rexec protocols, which all use insecure, plaintext methods of authentication, like passwords.
The client initiates SSH or RSH connection with echo FISH:;/bin/sh as the command executed on remote machine. This should make it possible for the server to distinguish FISH connections from normal RSH or SSH. The first two commands sent to the server are FISH and VER to negotiate FISH protocol, its version and extensions.
The Kermit protocol can operate over any computer-to-computer transport: direct serial, modem, or network (notably TCP/IP, including on connections secured by SSL, SSH, or Kerberos). OBject EXchange is a protocol for binary object wireless transfer via the Bluetooth standard. Bluetooth was conceived as a wireless replacement for RS-232.
Proprietary, RFB (VNC), SSH: RealVNC: 2002 2024-01-11, Server 7.9.0, Viewer 7.9.0 Proprietary: No No Remmina: RDP, RFB (VNC), SPICE, XDMCP, SSH, EXEC: Originally written by Vic Lee 2009 2022-12-20, 1.4.29 GPL-2.0-or-later: Yes Yes Remote Desktop Services/Terminal Services: RDP: Microsoft: 1998 2016 Proprietary: Yes Yes [e] Remote Utilities ...
Background execution allows a shell to run a command without user interaction in the terminal, freeing the command line for additional work with the shell.
An SSH server is a software program which uses the Secure Shell protocol to accept connections from remote computers. SFTP / SCP file transfers and remote terminal connections are popular use cases for an SSH server.