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Blender environment variables

Variable Description
BLENDER_USER_RESOURCES Replace default directory of all user files. Other BLENDER_USER_* variables override when set.
BLENDER_USER_CONFIG Directory for user configuration files.
BLENDER_USER_SCRIPTS Directory for user scripts.
BLENDER_USER_EXTENSIONS Directory for user extensions.
BLENDER_USER_DATAFILES Directory for user data files (icons, translations, ..).
BLENDER_SYSTEM_RESOURCES Replace default directory of all bundled resource files.
BLENDER_SYSTEM_SCRIPTS Directories to add extra scripts.
BLENDER_SYSTEM_EXTENSIONS Directory for system extensions repository.
BLENDER_SYSTEM_DATAFILES Directory to replace bundled datafiles.
BLENDER_SYSTEM_PYTHON Directory to replace bundled Python libraries.
BLENDER_CUSTOM_SPLASH Full path to an image that replaces the splash screen.
BLENDER_CUSTOM_SPLASH_BANNER Full path to an image to overlay on the splash screen.
OCIO Path to override the OpenColorIO configuration file.
TEMP Store temporary files here (MS-Windows).
TMPDIR Store temporary files here (UNIX Systems). The path must reference an existing directory or it will be ignored.
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blender env var PYTHONPATH is ignored by default, see --python-use-system-env

environment variable
Blender scripting