help with a simple counter!

[Gazz1982]

I am trying to create a simple counter which when running selects a vale 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

 

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

[trq]

Does it have to be in bourne shell? Could be done quite easily in Bash.

 

Something like...

 

#!/bin/bash

# set to size of list
listsize=3

# the list of values.
mylist=(123 456 789)

ran=$RANDOM
let "ran %= $listsize"

echo ${mylist[$ran]}

 

Hope this helps.