I wrote the following code in shell script:
num=$1
sum=0; rn=0
less=0; fact=0
while [ $num -gt 0 ]
do
rn=`expr $num % 10`
num=`expr $num / 10`
while [ $rn -gt 1 ]
do
less=`expr %rn - 1`
fact=`expr $rn \* less`
rn=`expr $rn - 1`
done
sum=`expr $sum + $fact`
done
echo $sum
but the terminal shows the following error without any line number : Terminal Error pic
Please tell me where did i mess up??
The immediate problem is
less=`expr %rn - 1`
Change that to
less=`expr $rn - 1`
and you should sail home. But you can also debug your scripts using the -x option of bash which would give you a line by line analysis.
The use of expr is discouraged as you could easily replace that with ((expression)) construct (or calc if you need floating point operations). Then,
fact=`expr $rn \* $less`
will become a much easier
((fact=rn*less))
The advantage is that you should not bother escaping characters that have special meanings in shell like *