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.. currentmodule:: astropy
.. _environment_variables:
*********************
Environment variables
*********************
.. glossary::
``XDG_CONFIG_HOME``
This environment variables control where configuration files are read
and written. Astropy will look for configuration files in
``$XDG_CONFIG_HOME/astropy``.
If not set, or if ``$XDG_CONFIG_HOME/astropy`` does not exist,
astropy will default to ``$HOME/.astropy/config``.
See :ref:`astropy_config` for how to programmatically set or get the
location of the corresponding directory at runtime.
``XDG_CACHE_HOME``
These environment variables control where data files are cached.
Astropy will cache files in ``$XDG_CACHE_HOME/astropy``.
If not set, or if ``$XDG_CACHE_HOME/astropy`` does not exist,
astropy will default to ``$HOME/.astropy/cache``.
See :ref:`utils-data` for how to programmatically set or get the
location of the corresponding directory at runtime.
.. note::
``XDG_CONFIG_HOME`` and ``XDG_CACHE_HOME`` come from a Linux-centric
specification
(see `here <https://wiki.archlinux.org/index.php/XDG_Base_Directory_support>`_
for more details), but ``astropy`` will use them on any OS as a more
general means to know where user-specific configurations should be written.
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