Tom :

Hi Micha,

I’ll try be more specific. The error generally reads “No such file or directory” at the line which references the text file of X Y co-ordinates. I have tried with many different file paths and extensions in the script. Also with a dummy set of co-ordinates to test. All with no success.

Thanks,
Tom

And you say that when you run the commands one by one, everything goes as expected? In that case it’s probably some syntax error, or so. Would you care to share the script somewhere so we can have a look, and (maybe) make some suggestions?
–
Micha

I’ll try be more specific. The error generally reads “No such file or directory” at the line which references the text file of X Y co-ordinates. I have tried with many different file paths and extensions in the script. Also with a dummy set of co-ordinates to test. All with no success.

Thanks,
Tom

Sorry, I think I got it! The bash file wasn’t in the same directory as the data – hence it was not liking anything I was asking it do. All set for now and it appears to be running! Fingers crossed.

Thank you

Thanks so much for the quick reply. I have tried to run this in the GRASS command prompt in windows but it continues to return an error. Perhaps I am doing it wrong. I have just copy pasted your code into the Windows prompt window that is part of the GUI. I also tried it in the command line – still did not work for me. Also, I noticed that in my cross_points.txt file I don’t have any headers – is that problem? I was expecting that Grass would output a .txt with headers, but that is not the case. Perhaps I need more patience. Now that I know the code is right for Grass I will keep trying, as I must simply just be doing some step wrong. Thanks again!

Stephanie :

I don’t get how you run the loop in GRASS, is that Python code and if so, how do you get it to work in GRASS? To me it is not intuitive to run r.water.outlet in a loop. Can you please explain to me a bit more how are you doing this and where I must input your code in the new GRASS with Python. Thank you. S

Hi Stephanie:
No it’s not Python, although you certainly could do the same loop in python.
The example above is a simple bash script. If you enter the commands in a terminal window on linux (or a GRASS command prompt in windows) it should work. If you have the drainage outlet points in a text file ‘cross_pts.txt’ then the loop structure:
while read X Y; do
.... ;
done < cross_pts.txt

reads each line separately till the end of the file and allows you to use the X,Y values for each individual run of r.water.outlet.
HTH,
Micha