examples/functions/fact

   1 # Who said shells can't use recursion?  Here is a factorial function.
   2 # You call it with a number as an argument, and it returns the factorial
   3 # of that number.
   4
   5 fact ()
   6 {
   7     local num=$1;
   8     if [ "$num" = 1 ] ; then
   9         echo 1
  10         return ;
  11     fi;
  12     echo $(( $num * $(fact $(( $num - 1 )) ) ))
  13 }