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

doc_src/cmds/if.rst

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+.. _cmd-if:
+
+if - conditionally execute a command
+====================================
+
+Synopsis
+--------
+
+::
+
+    if CONDITION; COMMANDS_TRUE...;
+    [else if CONDITION2; COMMANDS_TRUE2...;]
+    [else; COMMANDS_FALSE...;]
+    end
+
+Description
+-----------
+
+``if`` will execute the command ``CONDITION``. If the condition's exit status is 0, the commands ``COMMANDS_TRUE`` will execute.  If the exit status is not 0 and :ref:`else <cmd-else>` is given, ``COMMANDS_FALSE`` will be executed.
+
+You can use :ref:`and <cmd-and>` or :ref:`or <cmd-or>` in the condition. See the second example below.
+
+The exit status of the last foreground command to exit can always be accessed using the :ref:`$status <variables-status>` variable.
+
+Example
+-------
+
+The following code will print ``foo.txt exists`` if the file foo.txt exists and is a regular file, otherwise it will print ``bar.txt exists`` if the file bar.txt exists and is a regular file, otherwise it will print ``foo.txt and bar.txt do not exist``.
+
+
+
+::
+
+    if test -f foo.txt
+        echo foo.txt exists
+    else if test -f bar.txt
+        echo bar.txt exists
+    else
+        echo foo.txt and bar.txt do not exist
+    end
+
+
+The following code will print "foo.txt exists and is readable" if foo.txt is a regular file and readable
+
+
+::
+
+    if test -f foo.txt
+       and test -r foo.txt
+       echo "foo.txt exists and is readable"
+    end
+