soNguyenTo

#! /bin/bash

if [[ $1 -lt 2 ]]; then
    echo $1 khong phai la so nguyen to!
    exit 1
fi

i=2;
n=$(echo "sqrt ( $1 )" | bc -l);
echo $n
# typeset -i $n
n=${n%.*}
echo $n

# for (( i = 2; i -le n; i++ )); do
#   if [[ `expr $1 % i` -eq `expr 0` ]]; then
#       echo $1 khong phai la so nguyen to!
#       exit 1
#   fi
# done

for i in {2..$n}; do
    if [[ `expr $1 % i` -eq `expr 0` ]]; then
        echo $1 khong phai la so nguyen to!
        exit 1
    fi
done

echo $1 la so nguyen to!

exit 0