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Hub AI
Berkeley r-commands AI simulator
(@Berkeley r-commands_simulator)
Hub AI
Berkeley r-commands AI simulator
(@Berkeley r-commands_simulator)
Berkeley r-commands
The Berkeley r-commands are a suite of computer programs designed to enable users of one Unix system to log in or issue commands to another Unix computer via TCP/IP computer network. The r-commands were developed in 1982 by the Computer Systems Research Group at the University of California, Berkeley, based on an early implementation of TCP/IP (the protocol stack of the Internet).
The CSRG incorporated the r-commands into their Unix operating system, the Berkeley Software Distribution (BSD). The r-commands premiered in BSD v4.1. Among the programs in the suite are: rcp (remote copy), rexec (remote execution), rlogin (remote login), rsh (remote shell), rstat, ruptime, and rwho (remote who).
The r-commands were a significant innovation, and became de facto standards for Unix operating systems. With wider public adoption of the Internet, their inherent security vulnerabilities became a problem, and beginning with the development of Secure Shell protocols and applications in 1995, its adoption entirely supplanted the deployment and use of r-commands (and Telnet) on networked systems.
The original Berkeley package that provides rlogin also features rcp (remote-copy, allowing files to be copied over the network) and rsh (remote-shell, allowing commands to be run on a remote machine without the user logging into it).
As an example, the protocol is as follows:
The server would check that the user should have access. If so, it returns a message with nothing in it (not even a null character), meaning the connection is established. For example:
Both rlogin and rsh share the /etc/hosts.equiv (applies to all users on the server) and $HOME/.rhosts (applies to only the user that puts the file in its home folder) access-control scheme, although they connect to different daemons. rlogin connects to rlogind, while rsh connects to rshd.
hosts.equiv and .rhosts uses the same format. The following shows some aspects of the format:
This allows all users from host1 to login, user_a from host2 to login, no users from host3, all users on group1 except user_b, and no users on group2.
Berkeley r-commands
The Berkeley r-commands are a suite of computer programs designed to enable users of one Unix system to log in or issue commands to another Unix computer via TCP/IP computer network. The r-commands were developed in 1982 by the Computer Systems Research Group at the University of California, Berkeley, based on an early implementation of TCP/IP (the protocol stack of the Internet).
The CSRG incorporated the r-commands into their Unix operating system, the Berkeley Software Distribution (BSD). The r-commands premiered in BSD v4.1. Among the programs in the suite are: rcp (remote copy), rexec (remote execution), rlogin (remote login), rsh (remote shell), rstat, ruptime, and rwho (remote who).
The r-commands were a significant innovation, and became de facto standards for Unix operating systems. With wider public adoption of the Internet, their inherent security vulnerabilities became a problem, and beginning with the development of Secure Shell protocols and applications in 1995, its adoption entirely supplanted the deployment and use of r-commands (and Telnet) on networked systems.
The original Berkeley package that provides rlogin also features rcp (remote-copy, allowing files to be copied over the network) and rsh (remote-shell, allowing commands to be run on a remote machine without the user logging into it).
As an example, the protocol is as follows:
The server would check that the user should have access. If so, it returns a message with nothing in it (not even a null character), meaning the connection is established. For example:
Both rlogin and rsh share the /etc/hosts.equiv (applies to all users on the server) and $HOME/.rhosts (applies to only the user that puts the file in its home folder) access-control scheme, although they connect to different daemons. rlogin connects to rlogind, while rsh connects to rshd.
hosts.equiv and .rhosts uses the same format. The following shows some aspects of the format:
This allows all users from host1 to login, user_a from host2 to login, no users from host3, all users on group1 except user_b, and no users on group2.