Working with Shell script and GRASS

Question

So reading this GRASS/Shell documentation I decided to test my own for repeat using this lines

CATS="(v.db.select -c map=training columns=cat)" echo $CATS for i in $CATS do where="cat = $CATS" outputname=region_uspo_$CATS regionname=subset_uspo_$CATS

v.extract -o input=training type=area where=$condition output=$outputname done

but I keep getting an error message with v.extract

ERROR: v.extract: Sorry, is not a valid flag ERROR: v.extract: Sorry, is not a valid flag ERROR: v.extract: Sorry, is not a valid parameter ERROR: v.extract: Sorry, is not a valid parameter

now I've also tried this CATS="$(v.db.select -c map=training columns=cat)"

Can anyone help me figure out where I did wrong?

Answer 1

Ok so I typed before I was able to think and the actual loop was this:

CATS="$(v.db.select -c map=training columns=cat)" echo $CATS for i in $CATS do echo $i where="cat=$i" v.extract --overwrite input=training@user type=area where=$where output=region_uspo_$i done