Shell Programming and Scripting

apple 
orange
banana
grapes
dates
kiwi

"fruit type is apple in basket1"
"fruit type is orange in basket1"
"fruit type is banana in basket2"
"fruit type is grapes in basket2"
"fruit type is dates in basket3"
"fruit type is kiwi in basket3"

#!/bin/bash
i=0
while read a
do
i=`expr $i + 1`
echo "fruit type is $a in basket$i"
done < /tmp/fruit
 
Output i get at the moment is:
fruit type is apple in basket1
fruit type is orange in basket2
fruit type is banana in basket3
fruit type is grapes in basket4
fruit type is dates in basket5
fruit type is kiwi in basket6

#!/bin/bash
i=1
while read a
do
i=$((i + 1))
echo "fruit type is $a in basket$((i / 2))"
done < /tmp/fruit

cat -n file | while read NR REST; do echo "fruit etc. $REST is in basket$(((NR+1)/2))"; done