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There are a number of ways to run GRASS without a GUI.
(for example if the grass-gui package has not been installed)
Non-interactive: (e.g. a cron job on a back-end server)
Use the GRASS_BATCH_JOB environment variable to set the path to
the job script. Note this method may not work over NFS in HPC
Grid computing situations. See the GRASS wiki for details and
the workaround.
Interactive:
To use just the GRASS command line interface most things will
work as normal, including d.mon graphics X-monitors and rendering
with the PNG drivers. To avoid error messages you will probably
want to set "export GRASS_UI_TERM=1" in your ~/.grass.bashrc file
and run "g.gui text" within GRASS to set the default GUI mode.
From Quantum GIS or R-Statistics:
For use with QGIS you just need the grass-core and grass-doc
packages to be installed. For use with R typically you'd start
your R session from the GRASS command prompt, but it is
technically possible to run GRASS as a background job from R
(see the non-interactive notes above).
As always, help can be found on the GRASS Wiki site:
https://grass.osgeo.org/wiki/
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