Listing 1. yahtzee.sh


#!/bin/sh

function rollDie()
{
    sides=${1:-6}

    dieroll=$(( ( $RANDOM % $sides ) + 1 ))
}

rollDie ; dice[1]=$dieroll
rollDie ; dice[2]=$dieroll
rollDie ; dice[3]=$dieroll
rollDie ; dice[4]=$dieroll
rollDie ; dice[5]=$dieroll

echo -n "You rolled [${dice[1]}], [${dice[2]}], [${dice[3]}], "
echo    "[${dice[4]}] and [${dice[5]}]"

echo -n "Reroll which dice? "

read answer
for reroll in $answer
do
  if [ $reroll -lt 1 -o $reroll -gt 5 ] ; then
    echo "Invalid entry: $reroll. Please enter 1-5"
  else
    rollDie
    dice[$reroll]=$dieroll
  fi
done

echo -n "Your new  roll: [${dice[1]}], [${dice[2]}], [${dice[3]}], "
echo    "[${dice[4]}] and [${dice[5]}]"

exit 0