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Good catch, thanks.

Did you even try it?

Add /full/path/to/uni1.sh as shown:

[...]
case "$REPLY" in
1) echo "Start script 1 ($choice)." ; /full/path/to/uni1.sh;
[...]

That will echo out your chice to the...

area=0
total=0
for area in `grep "North America" countries | awk '{print $2}'`
do total=$(($total+$area))
done
echo $total

Example:
monitor:/tmp# area=0; total=0; for area in `grep...