kali linux终端crontab文件

Question

I do one crontab file

with this code

sum=0
i="y"

echo " Enter one no."
read n1
echo "Enter second no."
read n2
while [ $i = "y" ]
do
echo "1.Addition"
echo "2.Subtraction"
echo "3.Multiplication"
echo "4.Division"
echo "Enter your choice"
read ch
case $ch in
    1)sum=`expr $n1 + $n2`
     echo "Sum ="$sum;;
        2)sum=`expr $n1 - $n2`
     echo "Sub = "$sum;;
    3)sum=`expr $n1 \* $n2`
     echo "Mul = "$sum;;
    4)sum=`expr $n1 / $n2`
     echo "Div = "$sum;;
    *)echo "Invalid choice";;
esac
echo "Do u want to continue ?"
read i
if [ $i != "y" ]
then
    exit
fi
done

How can I make the program to do every 10 minutes ... where can I put this command ? 10 * * * *

Then, I make another one vi file with the same code can I make this file to crontab

Answer 1

With Linux, you probably are using vixie-cron (see manual page ). That provides an extension which simplifies step expressions. For example

*/10 * * * * path-to-my-script

would run