newbie needs a counter

[gazz1982]

Ok not sure if this is the right place for this but here it goes...
I am trying to create a simple counter which when running selects a value from a list
i.e.
The list is:
a1=123
a2=456
a2=789
etc

then in the code where is says coordinates= the appropiate value will appear
i.e.
coordinates=a1 therefore coordinates=123,123
coordinates=a2 therefore coordinates=456,456
coordinates=a3 therefore coordinates=789,789

it would end up echoing:
......output=z1 cooridnate=123,123 obs_elev=................

This is what i have so far

#!/bin/sh
#
DIST=60000
H=1.75
DEM=Aber7
####################
#begin loop
for(( i=1; i<=2; i++))
do

#select appropiate coordinate
a1=123
a2=456
##################

echo "calculating Line of Site for Site ${i}"
echo "r.los input=$DEM output=z${i} coordinates=$a1 obs_elev=$H max_dist=$DIST"



################
#end of loop


done
exit

Thanks

Gary

[Cabhan]

I don't understand the problem. Your script looks good. What's the question?