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+# Who said shells can't use recursion? Here is a factorial function.
+# You call it with a number as an argument, and it returns the factorial
+# of that number.
+
+fact ()
+{
+ local num=$1;
+ if [ "$num" = 1 ] ; then
+ echo 1
+ return ;
+ fi;
+ echo $(( $num * $(fact $(( $num - 1 )) ) ))
+}