I wanted to install an GRASS extension through a shell script but, upon execution it says:

You don't have permission to install extension to . Try to run g. extension with administration rights (su or sudo) sudo : : command not found

That been said I tried to execute this line of code:

add_on="$(g.extension extension=i.segment.uspo operation=add)" sudo "$add_on"

I know that I've done something wrong, but I don't know what.

Grass Version: Grass 7.0

Linux dist: Ubuntu 16.04 LTS

  • Which operating system do you use? And, which GRASS GIS version? Please add this to the question. – markusN Jun 11 '17 at 20:03

So the main problems were two.

1) As a newbie I didn't know that I had to install "grass-dev" and I solved it by typing:

sudo apt-get install grass-dev 

2) It was my mistake that I forgot to change the ownership for my Grass folder by typing:

sudo chown -R $usern $EXT_ADDONS



is username:group and


is the Grass directory

and in case there is an error where a file cannot be downloaded for whatever reason (i.e /var/cache/apt/archives/grass-dev_7.0.5-1~xenial1_amd64.deb) you can fix it by typing

sudo dpkg -i --force-overwrite 'file'

in the case of our paradigm

sudo dpkg -i --force-overwrite /var/cache/apt/archives/grass-dev_7.0.5-1~xenial1_amd64.deb

which isn't usually the best idea, but it will make grass-dev work


I was successful installing add-ons via the command line with:

 grass -text -c EPSG:4326 --exec g.extension extension=i.segment.uspo operation=add

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