We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/else.rst

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+.. _cmd-else:
+
+else - execute command if a condition is not met
+================================================
+
+Synopsis
+--------
+
+::
+
+    if CONDITION; COMMANDS_TRUE...; [else; COMMANDS_FALSE...;] end
+
+Description
+-----------
+
+:ref:`if <cmd-if>` will execute the command ``CONDITION``. If the condition's exit status is 0, the commands ``COMMANDS_TRUE`` will execute. If it is not 0 and ``else`` is given, ``COMMANDS_FALSE`` will be executed.
+
+
+Example
+-------
+
+The following code tests whether a file ``foo.txt`` exists as a regular file.
+
+
+
+::
+
+    if test -f foo.txt
+        echo foo.txt exists
+    else
+        echo foo.txt does not exist
+    end
+