script prompts the user to enter four lines.

Shell Programming and Scripting
1

The script prompts the user to enter four lines.

2

How about this

for i in 1 2 3 4
do
   read -p "Enter line $i: " line[$i]
done
 
for i in 1 2 3 4
do
   echo "Line $i was: " ${line}
done

Depending on your shell you may be able to use {1..4} in place of 1 2 3 4