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.. _environmentvars:
================================================================================
Environment variables
================================================================================
PROJ can be controlled by setting environment variables. Most users will
have a use for the :envvar:`PROJ_LIB`.
On UNIX systems environment variables can be set for a shell-session with::
$ export VAR="some variable"
or it can be set for just one command line call::
$ VAR="some variable" ./cmd
Environment variables on UNIX are usually removed with the ``unset`` command::
$ unset VAR
On windows systems environment variables can be set in the command line with::
> set VAR="some variable"
```VAR`` will be available for the entire session, unless it is unset. This is
done by setting the variable with no content::
> set VAR=
.. envvar:: PROJ_LIB
The location of PROJ :doc:`resource files<../resource_files>`.
Starting with PROJ 6, multiple directories can be specified. On Unix, they
should be separated by the colon (:) character. on Windows, by the semi-colon (;)
character.
PROJ is hardcoded to look for resource files
in other locations as well, amongst those are the
installation directory (usually ``share/proj`` under the PROJ
installation root) and the current folder.
You can also set the location of the resource files using
:func:`proj_context_set_search_paths` in the `proj.h` API header.
.. versionchanged:: 6.1.0
Starting with PROJ version 6.1.0, the paths set by
:func:`proj_context_set_search_paths` will have priority over the
:envvar:`PROJ_LIB` to allow for mutliple versions of PROJ
resource files on your system without conflicting.
.. envvar:: PROJ_DEBUG
Set the debug level of PROJ. The default debug level is zero, which results
in no debug output when using PROJ. A number from 1-3, whit 3 being the most
verbose setting.
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