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

doc_src/cmds/eval.rst

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+.. _cmd-eval:
+
+eval - evaluate the specified commands
+======================================
+
+Synopsis
+--------
+
+::
+
+    eval [COMMANDS...]
+
+
+Description
+-----------
+``eval`` evaluates the specified parameters as a command. If more than one parameter is specified, all parameters will be joined using a space character as a separator.
+
+If your command does not need access to stdin, consider using ``source`` instead.
+
+If no piping or other compound shell constructs are required, variable-expansion-as-command, as in  ``set cmd ls -la; $cmd``, is also an option.
+
+
+Example
+-------
+
+The following code will call the ls command and truncate each filename to the first 12 characters.
+
+::
+
+    set cmd ls \| cut -c 1-12
+    eval $cmd
+
+