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

doc_src/cmds/while.rst

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+.. _cmd-while:
+
+while - perform a command multiple times
+========================================
+
+Synopsis
+--------
+
+::
+
+    while CONDITION; COMMANDS...; end
+
+
+Description
+-----------
+
+``while`` repeatedly executes ``CONDITION``, and if the exit status is 0, then executes ``COMMANDS``.
+
+The exit status of the while loop is the exit status of the last iteration of the ``COMMANDS`` executed, or 0 if none were executed. (This matches other shells and is POSIX-compatible.)
+
+You can use :ref:`and <cmd-and>` or :ref:`or <cmd-or>` for complex conditions. Even more complex control can be achieved with ``while true`` containing a :ref:`break <cmd-break>`.
+
+Example
+-------
+
+
+
+::
+
+    while test -f foo.txt; or test -f bar.txt ; echo file exists; sleep 10; end
+    # outputs 'file exists' at 10 second intervals as long as the file foo.txt or bar.txt exists.
+