[shell]递归求阶乘

#!/usr/bin/env bash

jc ()

{

    local num=$1

    if [[ "$num" -eq 0 ]];

    then

        fac=1

    else

        let "dec=$num-1"

        jc $dec

        let "fac=$num * $fac"

    fi

    return $fac

}

jc $1

echo "fac of $1 is $fac"