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Exit - add exit in the script will terminate the script

#! /bin/bash  

echo "line 1"
echo "line 2"
echo "line 3"

read -p " How old are you? " age 
if [ $age -lt 0 ]; then 
    echo "you cannot have negative age!"
    #if we get negative, programe exit here. if positive, programe will continue.

echo "line 4"
echo "line 5"