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//proc/self/root/usr/share/doc/bash-3.2/functions/fact
# 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 )) ) )) }