Information about Remote Shell
rsh (remote shell) is a command line computer program which can execute shell commands as another user, and on another computer across a computer network. The remote system on which the rsh executes the command needs to be running the rshd daemon. The rsh command shares the same name as another common UNIX utility, the restricted shell, which first appeared in PWB/UNIX; in System V Release 4, the restricted shell is often located at /usr/lib/rsh.
rsh originated as part of the BSD Unix operating system, along with rcp, as part of the rlogin package on 4.2BSD in 1983. rsh has since been ported to other operating systems.
As described in the rlogin article, the rsh protocol is not secure for network use, because it sends unencrypted information over the network, among other reasons. Some implementations also authenticate by sending unencrypted passwords over the network. rsh has largely been replaced by the very similar ssh (secure shell) program on untrusted networks like the internet.
As an example of rsh use, the following executes the command mkdir testdir as user remoteuser on the computer host.example.com: rsh -l remoteuser host.example.com "mkdir testdir"
After the command has finished rsh terminates. If no command is specified then rsh will log in on the remote system using rlogin. The network location of the remote computer is looked up using the Domain Name System.
rsh uses well-known port TCP 514.
rsh originated as part of the BSD Unix operating system, along with rcp, as part of the rlogin package on 4.2BSD in 1983. rsh has since been ported to other operating systems.
As described in the rlogin article, the rsh protocol is not secure for network use, because it sends unencrypted information over the network, among other reasons. Some implementations also authenticate by sending unencrypted passwords over the network. rsh has largely been replaced by the very similar ssh (secure shell) program on untrusted networks like the internet.
As an example of rsh use, the following executes the command mkdir testdir as user remoteuser on the computer host.example.com: rsh -l remoteuser host.example.com "mkdir testdir"
After the command has finished rsh terminates. If no command is specified then rsh will log in on the remote system using rlogin. The network location of the remote computer is looked up using the Domain Name System.
rsh uses well-known port TCP 514.
References
command line interface or CLI is a method of interacting with an operating system or software using a command line interpreter. This command line interpreter may be a text terminal, terminal emulator, or remote shell client such as PuTTY.
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A computer program is one or more instructions that are intended for execution by a computer. Specifically, it is a symbol or combination of symbols forming an algorithm that may or may not terminate, and that algorithm is written in a programming language.
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command line interface or CLI is a method of interacting with an operating system or software using a command line interpreter. This command line interpreter may be a text terminal, terminal emulator, or remote shell client such as PuTTY.
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User in a computing context refers to one who uses a computer system. Users may need to identify themselves for the purposes of accounting, security, logging and resource management.
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as a college campus, industrial complex, or a military base. A CAN, may be considered a type of MAN (metropolitan area network), but is generally limited to an area that is smaller than a typical MAN.
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daemon (IPA pronunciation: /'dimən/ or /'deɪmən/[1]
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Unices by Bell
Research Unix
V6 (1975)
V7 (1979)
V8 (1985)
V9 (1986)
V10 (1989)
CB Unix
PWB/UNIX PWB/UNIX (for Programmer's Workbench) was an early version of the Unix operating system.
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Research Unix
V6 (1975)
V7 (1979)
V8 (1985)
V9 (1986)
V10 (1989)
CB Unix
PWB/UNIX PWB/UNIX (for Programmer's Workbench) was an early version of the Unix operating system.
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Unix System V, commonly abbreviated SysV and rarely called System 5, was one of the versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, termed Releases 1, 2, 3 and 4.
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Berkeley Software Distribution (BSD, sometimes called Berkeley Unix) is the UNIX derivative distributed by the University of California, Berkeley, starting in the 1970s.
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An operating system (OS) is the software that manages the sharing of the resources of a computer. An operating system processes system data and user input, and responds by allocating and managing tasks and internal system resources as a service to users and programs of the
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rcp stands for the Unix 'remote copy' command. It is a command on the Unix operating systems that is used to remotely copy -- to copy one or more files from one computer system to another. It typically uses the TCP/IP protocol and the .
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In computing, rlogin is a Unix software utility that allows users to log in on another host via a network, communicating via TCP port 513. It was first distributed as part of the 4.2BSD release.
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19th century - 20th century - 21st century
1950s 1960s 1970s - 1980s - 1990s 2000s 2010s
1980 1981 1982 - 1983 - 1984 1985 1986
Year 1983 (MCMLXXXIII
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1950s 1960s 1970s - 1980s - 1990s 2000s 2010s
1980 1981 1982 - 1983 - 1984 1985 1986
Year 1983 (MCMLXXXIII
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In computing, rlogin is a Unix software utility that allows users to log in on another host via a network, communicating via TCP port 513. It was first distributed as part of the 4.2BSD release.
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protocol is a convention or standard that controls or enables the connection, communication, and data transfer between two computing endpoints. In its simplest form, a protocol can be defined as the rules governing the syntax, semantics, and synchronization of communication.
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Computer security is a branch of information security applied to both theoretical and actual computer systems. Computer security is a branch of computer science that addresses enforcement of 'secure' behavior on the operation of computers.
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Cryptography (or cryptology; derived from Greek κρυπτός kryptós "hidden," and the verb γράφω gráfo "write" or λεγειν legein
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Authentication (from Greek αυθεντικός; real or genuine, from authentes; author) is the act of establishing or confirming something (or someone) as authentic, that is, that claims made by or about the thing are true.
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A password is a form of secret authentication data that is used to control access to a resource. The password is kept secret from those not allowed access, and those wishing to gain access are tested on whether or not they know the password and are granted or denied access
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Secure Shell or SSH is a network protocol that allows data to be exchanged over a secure channel between two computers. Encryption provides confidentiality and integrity of data.
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Internet is a worldwide, publicly accessible series of interconnected computer networks that transmit data by packet switching using the standard Internet Protocol (IP). It is a "network of networks" that consists of millions of smaller domestic, academic, business, and government
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In computing, rlogin is a Unix software utility that allows users to log in on another host via a network, communicating via TCP port 513. It was first distributed as part of the 4.2BSD release.
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On the Internet, the Domain Name System (DNS) associates various sorts of information with so-called domain names; most importantly, it serves as the "phone book" for the Internet by translating human-readable computer hostnames, e.g. en.wikipedia.
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TCP and UDP are transport protocols used for communication between computers. The IANA is responsible for assigning port numbers to specific uses.
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Ranges
The port numbers are divided into three ranges.- The Well Known Ports are those in the range 0–1023.
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The Transmission Control Protocol (TCP) is one of the core protocols of the Internet protocol suite. TCP provides reliable, in-order delivery of a stream of bytes, making it suitable for applications like file transfer and e-mail.
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man pages (short for "manual pages"). The Unix command used to display them is man. Each page is a self-contained document.
man <page_name>
at a shell prompt, for example, "
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Usage
To read a page from the manual, one can use the commandman <page_name>
at a shell prompt, for example, "
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