diff --git a/Doc/library/os.rst b/Doc/library/os.rst
index 1bc9126..eb9cb19 100644
--- a/Doc/library/os.rst
+++ b/Doc/library/os.rst
@@ -677,6 +677,16 @@
    Availability: Unix, Windows.
 
 
+.. data:: SEEK_SET
+          SEEK_CUR
+          SEEK_END
+
+   Parameters to the :func:`lseek` function. Their values are 0, 1, and 2,
+   respectively. Availability: Windows, Unix.
+
+   .. versionadded:: 2.5
+
+
 .. function:: open(file, flags[, mode])
 
    Open the file *file* and set various flags according to *flags* and possibly its
@@ -686,7 +696,8 @@
 
    For a description of the flag and mode values, see the C run-time documentation;
    flag constants (like :const:`O_RDONLY` and :const:`O_WRONLY`) are defined in
-   this module too (see below).
+   this module too (see :ref:`open-constants`).  In particular, on Windows adding
+   :const:`O_BINARY` is needed to open files in binary mode.
 
    Availability: Unix, Windows.
 
@@ -774,6 +785,12 @@
       :func:`fdopen`, or :data:`sys.stdout` or :data:`sys.stderr`, use its
       :meth:`~file.write` method.
 
+
+.. _open-constants:
+
+``open()`` flag constants
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
 The following constants are options for the *flags* parameter to the
 :func:`~os.open` function.  They can be combined using the bitwise OR operator
 ``|``.  Some of them are not available on all platforms.  For descriptions of
@@ -825,16 +842,6 @@
    the C library.
 
 
-.. data:: SEEK_SET
-          SEEK_CUR
-          SEEK_END
-
-   Parameters to the :func:`lseek` function. Their values are 0, 1, and 2,
-   respectively. Availability: Windows, Unix.
-
-   .. versionadded:: 2.5
-
-
 .. _os-file-dir:
 
 Files and Directories
diff --git a/Doc/library/socket.rst b/Doc/library/socket.rst
index 51f3b82..22579ae 100644
--- a/Doc/library/socket.rst
+++ b/Doc/library/socket.rst
@@ -664,10 +664,10 @@
 .. method:: socket.recv_into(buffer[, nbytes[, flags]])
 
    Receive up to *nbytes* bytes from the socket, storing the data into a buffer
-   rather than creating a new string.     If *nbytes* is not specified (or 0),
-   receive up to the size available in the given buffer. See the Unix manual page
-   :manpage:`recv(2)` for the meaning of the optional argument *flags*; it defaults
-   to zero.
+   rather than creating a new string.  If *nbytes* is not specified (or 0),
+   receive up to the size available in the given buffer.  Returns the number of
+   bytes received.  See the Unix manual page :manpage:`recv(2)` for the meaning
+   of the optional argument *flags*; it defaults to zero.
 
    .. versionadded:: 2.5
 
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 5189f1f..8c16d4e 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -1757,6 +1757,48 @@
 locking/synchronization.
 
 
+Customizing instance and subclass checks
+----------------------------------------
+
+.. versionadded:: 2.6
+
+The following methods are used to override the default behavior of the
+:func:`isinstance` and :func:`issubclass` built-in functions.
+
+In particular, the metaclass :class:`abc.ABCMeta` implements these methods in
+order to allow the addition of Abstract Base Classes (ABCs) as "virtual base
+classes" to any class or type (including built-in types), and including to other
+ABCs.
+
+.. method:: class.__instancecheck__(self, instance)
+
+   Return true if *instance* should be considered a (direct or indirect)
+   instance of *class*. If defined, called to implement ``isinstance(instance,
+   class)``.
+
+
+.. method:: class.__subclasscheck__(self, subclass)
+
+   Return true if *subclass* should be considered a (direct or indirect)
+   subclass of *class*.  If defined, called to implement ``issubclass(subclass,
+   class)``.
+
+
+Note that these methods are looked up on the type (metaclass) of a class.  They
+cannot be defined as class methods in the actual class.  This is consistent with
+the lookup of special methods that are called on instances, only that in this
+case the instance is itself a class.
+
+.. seealso::
+
+   :pep:`3119` - Introducing Abstract Base Classes
+      Includes the specification for customizing :func:`isinstance` and
+      :func:`issubclass` behavior through :meth:`__instancecheck__` and
+      :meth:`__subclasscheck__`, with motivation for this functionality in the
+      context of adding Abstract Base Classes (see the :mod:`abc` module) to the
+      language.
+
+
 .. _callable-types:
 
 Emulating callable objects
diff --git a/Lib/pipes.py b/Lib/pipes.py
index 25e9915..02e1257 100644
--- a/Lib/pipes.py
+++ b/Lib/pipes.py
@@ -263,11 +263,11 @@
 
 # Reliably quote a string as a single argument for /bin/sh
 
-_safechars = string.ascii_letters + string.digits + '!@%_-+=:,./' # Safe unquoted
-_funnychars = '"`$\\'                           # Unsafe inside "double quotes"
+# Safe unquoted
+_safechars = frozenset(string.ascii_letters + string.digits + '@%_-+=:,./')
 
 def quote(file):
-    ''' return a shell-escaped version of the file string '''
+    """Return a shell-escaped version of the file string."""
     for c in file:
         if c not in _safechars:
             break
@@ -275,11 +275,6 @@
         if not file:
             return "''"
         return file
-    if '\'' not in file:
-        return '\'' + file + '\''
-    res = ''
-    for c in file:
-        if c in _funnychars:
-            c = '\\' + c
-        res = res + c
-    return '"' + res + '"'
+    # use single quotes, and put single quotes into double quotes
+    # the string $'b is then quoted as '$'"'"'b'
+    return "'" + file.replace("'", "'\"'\"'") + "'"
diff --git a/Lib/test/test_pipes.py b/Lib/test/test_pipes.py
index dd1cc9e..072d023 100644
--- a/Lib/test/test_pipes.py
+++ b/Lib/test/test_pipes.py
@@ -62,9 +62,10 @@
         self.assertEqual(open(TESTFN).read(), d)
 
     def testQuoting(self):
-        safeunquoted = string.ascii_letters + string.digits + '!@%_-+=:,./'
-        unsafe = '"`$\\'
+        safeunquoted = string.ascii_letters + string.digits + '@%_-+=:,./'
+        unsafe = '"`$\\!'
 
+        self.assertEqual(pipes.quote(''), "''")
         self.assertEqual(pipes.quote(safeunquoted), safeunquoted)
         self.assertEqual(pipes.quote('test file name'), "'test file name'")
         for u in unsafe:
@@ -72,9 +73,7 @@
                               "'test%sname'" % u)
         for u in unsafe:
             self.assertEqual(pipes.quote("test%s'name'" % u),
-                              '"test\\%s\'name\'"' % u)
-
-        self.assertEqual(pipes.quote(''), "''")
+                             "'test%s'\"'\"'name'\"'\"''" % u)
 
     def testRepr(self):
         t = pipes.Template()
diff --git a/Misc/NEWS b/Misc/NEWS
index 43d4c4b..09ab65e 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -29,7 +29,9 @@
 
 - Raise a TypeError when trying to delete a T_STRING_INPLACE struct member.
 
-- Issue #1583863: An unicode subclass can now override the __unicode__ method
+- Issue #1583863: An unicode subclass can now override the __unicode__ method.
+
+- Issue #7507: Quote "!" in pipes.quote(); it is special to some shells.
 
 - Issue #7544: Preallocate thread memory before creating the thread to avoid
   a fatal error in low memory condition.
diff --git a/Misc/developers.txt b/Misc/developers.txt
index 6d91a70..006bd31 100644
--- a/Misc/developers.txt
+++ b/Misc/developers.txt
@@ -17,6 +17,11 @@
 Permissions History
 -------------------
 
+- Jean-Paul Calderone was given commit access on April 6 2010 by
+  GFB, at suggestion of Michael Foord and others.
+
+- Brian Curtin was given commit access on March 24 2010 by MvL.
+
 - Florent Xicluna was given commit access on February 25 2010 by
   MvL, based on Antoine Pitrou's recommendation.