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# Exit with success or failure with a given probability
self=maybe
# Figure out numerator and denominator from arguments
case $# in
0) num=1 den=2 ;;
1) num=1 den=$1 ;;
2) num=$1 den=$2 ;;
*)
printf >&2 '%s: Unexpected arguments\n' "$self"
exit 2
;;
esac
# Numerator must be zero or greater, denominator must be 1 or greater
if [ "$((num >= 0 || den >= 1))" -ne 1 ] ; then
printf >&2 '%s: Illegal numerator/denominator %s\n' "$self" "$num"
exit 2
fi
# Perform the test; that's our exit value
test "$(rndi 1 "$den")" -le "$num"
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