/usr/share/doc/bash/examples/functions/fact is in bash-doc 4.3-6ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 | # 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 )) ) ))
}
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