Lab46 Wiki

This script uses bc to calculate experience in Dungeons and Dragons Edition 3.5 based on the Challenge Rating of the encounter and the average Character Level of the party.

#!/bin/bash
# xpscript - D&D script for calculating experience from enounters based on CR of
# the encounter and level of the party
 
if [ $# == 0 ]
	then
		echo "Usage: $0 CR LV" | sed "s/\/.*\///g"
		exit
fi
cr=$1
lv=$2
test1=`echo "($cr-$lv)%2" | bc`
if [ "$test1" == "0" ] #If CR-LV is even or 0
	then
		xp=`echo "scale=5; $lv*300*sqrt(2)^($cr-$lv)" | bc | sed -e "s/\(\.[0-9]\).*/\1/g"`
		xp=`echo "($xp+0.1)/1" | bc`
		echo "$xp"
	else # CR-LV is odd
		cr1=`echo "$cr+1" | bc`
		cr2=`echo "$cr-1" | bc`
		xp2=`echo "scale=5; $lv*300*sqrt(2)^($cr1-$lv)" | bc | sed -e "s/\(\.[0-9]\).*/\1/g"`
		xp1=`echo "($xp1+0.1)/1" | bc`
		xp2=`echo "scale=5; $lv*300*sqrt(2)^($cr2-$lv)" | bc | sed -e "s/\(\.[0-9]\).*/\1/g"`
		xp2=`echo "($xp2+0.1)/1" | bc`
		xp=`echo "($xp1+$xp2)/2" | bc`
		echo $xp
fi
exit

This script uses a lot of command expansions to do the calculations and variable declarations before finally using bc to calculate the results of the formula for the encounter experience. Not really an important script but goes to further show that bash is a powerful utility that can be used to do many things.