add section explaining the use of the exit() method (#314)

* add section explaining the use of the exit() method

* Update source/write-scripts.txt

Co-authored-by: Massimiliano Marcon <[email protected]>

---------

Co-authored-by: Massimiliano Marcon <[email protected]>

Author: MongoCaleb

source/run-commands.txt

@@ -104,6 +104,11 @@ it issues a warning.
 Pressing ``Ctrl + C`` once will not exit :binary:`~bin.mongosh`, press
 ``Ctrl + C`` twice to  exit :binary:`~bin.mongosh`.
 
+You can also terminate a script from within the script code by calling the 
+``exit(<code>)`` command. For more information, refer to 
+:ref:`Terminate a Script on Error <mongosh-terminate-script>`.
+
+
 Command Exceptions
 ------------------
 

source/write-scripts.txt

@@ -271,6 +271,24 @@ You can also specify the shortened form of the options:
    space it will not be saved in your command history. This minimizes
    exposure if you enter passwords on the command line.
 
+
+.. _mongosh-terminate-script:
+
+Terminate a Script on Error
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+It is often useful to terminate a running script if an exception is thrown, or 
+in the case of unexpected results. Exiting at a specific point in the script 
+prevents the execution of unnecessary code and potentially unexpected results.
+
+To terminate a script, you can call the ``exit(<code>)`` method, where the 
+``<code>`` is any user-specified value. 
+
+As a best practice, wrap code in a ``try - catch``, calling the 
+``exit`` method in the ``catch`` block. Likewise, to check the results of a query or any command, 
+you can add an ``if - else`` statement and call the ``exit`` method if the 
+results are not what is expected.
+
 .. _mongosh-write-scripts-config-file:
 
 Execute Code From a Configuration File