auto
      	disabled
      nr_free_pages 4904137
nr_alloc_batch 888
nr_inactive_anon 15268
nr_active_anon 99132
nr_inactive_file 159386
nr_active_file 86020
nr_unevictable 4162
nr_mlock 4165
nr_anon_pages 65905
nr_mapped 23451
nr_file_pages 262301
nr_dirty 37
nr_writeback 0
nr_slab_reclaimable 23359
nr_slab_unreclaimable 7998
nr_page_table_pages 4499
nr_kernel_stack 535
nr_unstable 0
nr_bounce 0
nr_vmscan_write 0
nr_vmscan_immediate_reclaim 0
nr_writeback_temp 0
nr_isolated_anon 0
nr_isolated_file 0
nr_shmem 15947
nr_dirtied 30270
nr_written 26748
numa_hit 32351314
numa_miss 0
numa_foreign 0
numa_interleave 25341
numa_local 32351314
numa_other 0
workingset_refault 0
workingset_activate 0
workingset_nodereclaim 0
nr_anon_transparent_hugepages 70
nr_free_cma 0
 ?÷     
:mod:`subprocess` --- Subprocess management
===========================================

.. module:: subprocess
   :synopsis: Subprocess management.
.. moduleauthor:: Peter Ă…strand <astrand@lysator.liu.se>
.. sectionauthor:: Peter Ă…strand <astrand@lysator.liu.se>


.. versionadded:: 2.4

The :mod:`subprocess` module allows you to spawn new processes, connect to their
input/output/error pipes, and obtain their return codes.  This module intends to
replace several other, older modules and functions, such as::

   os.system
   os.spawn*
   os.popen*
   popen2.*
   commands.*

Information about how the :mod:`subprocess` module can be used to replace these
modules and functions can be found in the following sections.

.. seealso::

   :pep:`324` -- PEP proposing the subprocess module


Using the :mod:`subprocess` Module
----------------------------------

The recommended approach to invoking subprocesses is to use the following
convenience functions for all use cases they can handle. For more advanced
use cases, the underlying :class:`Popen` interface can be used directly.


.. function:: call(args, *, stdin=None, stdout=None, stderr=None, shell=False)

   Run the command described by *args*.  Wait for command to complete, then
   return the :attr:`returncode` attribute.

   The arguments shown above are merely the most common ones, described below
   in :ref:`frequently-used-arguments` (hence the slightly odd notation in
   the abbreviated signature). The full function signature is the same as
   that of the :class:`Popen` constructor - this functions passes all
   supplied arguments directly through to that interface.

   Examples::

      >>> subprocess.call(["ls", "-l"])
      0

      >>> subprocess.call("exit 1", shell=True)
      1

   .. warning::

      Invoking the system shell with ``shell=True`` can be a security hazard
      if combined with untrusted input. See the warning under
      :ref:`frequently-used-arguments` for details.

   .. note::

      Do not use ``stdout=PIPE`` or ``stderr=PIPE`` with this function. As
      the pipes are not being read in the current process, the child
      process may block if it generates enough output to a pipe to fill up
      the OS pipe buffer.


.. function:: check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False)

   Run command with arguments.  Wait for command to complete. If the return
   code was zero then return, otherwise raise :exc:`CalledProcessError`. The
   :exc:`CalledProcessError` object will have the return code in the
   :attr:`returncode` attribute.

   The arguments shown above are merely the most common ones, described below
   in :ref:`frequently-used-arguments` (hence the slightly odd notation in
   the abbreviated signature). The full function signature is the same as
   that of the :class:`Popen` constructor - this functions passes all
   supplied arguments directly through to that interface.

   Examples::

      >>> subprocess.check_call(["ls", "-l"])
      0

      >>> subprocess.check_call("exit 1", shell=True)
      Traceback (most recent call last):
         ...
      subprocess.CalledProcessError: Command 'exit 1' returned non-zero exit status 1

   .. versionadded:: 2.5

   .. warning::

      Invoking the system shell with ``shell=True`` can be a security