Create command.rst

source/advanced/command.rst

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+##########
+Command
+##########
+
+Provides a conventient way to execute system, PHP, switch and SQL commands. 
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+
+.. image:: ../_static/images/fusionpbx_command.jpg
+        :scale: 85%
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+
+*  Click the **drop down box** on the right to choose from **Switch**, **PHP**, Shell and SQL to execute commands.