rsh - Remote Shell
====================

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        **What is rsh?**

        rsh (Remote Shell) is a network protocol and command-line utility that allows a user to execute shell commands on a remote Unix-based system without logging in interactively.

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        **Why is rsh useful?**

        * Allows remote execution of commands on Unix/Linux systems.
        * Useful for scripting and automating tasks across multiple machines.
        * Lightweight and easy to use in trusted network environments.
        * Precedes more secure protocols like SSH.

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        **How it works?**

        * The client connects to the remote server via TCP.
        * Authentication is often done using `.rhosts` files or hosts.equiv for trust-based access.
        * The client sends commands to the remote shell, which executes them and sends back the output.
        * Data, including commands and responses, are sent unencrypted.

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        **Where is rsh used?**

        * Used in legacy Unix and Linux environments for remote command execution.
        * Common in older networks or internal trusted environments.
        * Largely replaced by SSH in modern systems due to security concerns.

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        **Which OSI layer does this protocol belong to?**

        * rsh operates at the **Application Layer (Layer 7)**.
        * Uses TCP at the Transport Layer for reliable communication.

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        **IS rsh windows specific?**

        * No, rsh is not Windows-specific.
        * While originally designed for Unix-like systems, Windows clients for rsh exist via tools like Cygwin or PuTTY.

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        **IS rsh Linux Specific?**

        * No, rsh is not Linux-specific.
        * Available on many Unix-like operating systems including Linux, BSD, and Solaris.

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        **Which Transport Protocol is used by rsh?**

        * rsh uses **TCP** as its transport protocol.

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        **Which Port is used by rsh?**

        * rsh typically uses **TCP port 514**.

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        **Is rsh using Client server model?**

        * Yes, rsh uses the **client-server model**.
        * The **client** sends commands to the **rsh server** on the remote machine, which executes them and returns output.

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        Topics in this section,

                * :ref:`Learnings in this section <rsh_step1>`

                * :ref:`Terminology <rsh_step2>`

                * :ref:`Version Info <rsh_step3>`

                * :ref:`rsh Version&IEEE Details <rsh_step5>`

                * :ref:`rsh Basic Setup on Ubuntu using IPv4 <rsh_step18>`

                * :ref:`rsh Basic Setup on Ubuntu using IPv6 <rsh_step19>`

                * :ref:`rsh Protocol Packet Details <rsh_step6>`

                * :ref:`rsh Usecases <rsh_step7>`

                * :ref:`rsh Basic Features <rsh_step8>`
                    
                * :ref:`Reference links <rsh_step17>`


.. _rsh_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _rsh_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _rsh_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info


.. _rsh_step5:

.. tab-set::

    .. tab-item:: rsh Version&RFC Details

        * rfc details

.. _rsh_step18:

.. tab-set::

    .. tab-item:: rsh Basic Setup on Ubuntu using IPv4

       * setup

.. _rsh_step19:

.. tab-set::
  
   .. tab-item:: rsh Basic Setup on Ubuntu using IPv6

     * setup
       
.. _rsh_step6:

.. tab-set::

    .. tab-item:: rsh Protocol Packet Details

        * packet details
       


.. _rsh_step7:

.. tab-set::

    .. tab-item:: rsh Usecases

       * usecases
        
        

.. _rsh_step8:

.. tab-set::

    .. tab-item:: rsh Basic Features
    
        * features 



.. _rsh_step17:

.. tab-set::

    .. tab-item:: Reference links
     
       * Reference links