Recursive function in bash

Question

I want to do a function that will return the factorial of a number in bash

Here\'s the current code that doesn\'t work, can anyone tell me what\'s wrong and how to c

Answer 1

#-----------------factorial ------------------------
# using eval to avoid process creation
fac=25
factorial()
{
    if [[ $1 -le 1 ]]
    then
        eval $2=1
    else

        factorial $[$1-1] $2
        typeset f2
        eval f2=\$$2
        ((f2=f2*$1))
        eval $2=$f2

    fi
}
time factorial $fac res 
echo "factorial =$res"