aoc day3

day3

Part one script
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#!/bin/bash
file="day3.txt"
dupes=""
declare -i tally
while read -r line; do
        linelen=${#line}
        let linehalf=$linelen/2
        a=$(echo "$line" | cut -c1-$linehalf)
        b=$(echo "$line" | cut -c$(($linehalf+1))-$linelen)
        for (( c=0; c<$linehalf; c++))
        do
                if [ `expr index $b ${a:$c:1}` -gt 0 ]; then
                        dupes+=${a:$c:1}
                        break
                fi
        done
done <$file
echo "$dupes"

for (( d=0; d<${#dupes}; d++))
do
        curchar=${dupes:$d:1}
        ascii=$(printf '%d' "'$curchar")
        if [ $ascii -gt 91 ];
        then
                ascii=$((ascii-=96))
        else
                ascii=$((ascii-=38))
        fi
        tally+=$ascii
done
echo "$tally"

*************************************************
Part two script
*************************************************
#!/bin/bash
file="day3.txt"
dupes=""
declare -i tally
while true; do
        read -r one || break
        read -r two  || break
        read -r three || break
        linelen=${#one}
        let linehalf=$linelen/2
        for (( c=0; c<$linelen; c++))
        do
                if [[ `expr index $two ${one:$c:1}` -gt 0 && `expr index $three ${one:$c:1}` -gt 0 ]]; then
                        dupes+=${one:$c:1}
                        break
                fi
        done
done <$file
echo "$dupes"

for (( d=0; d<${#dupes}; d++))
do
        curchar=${dupes:$d:1}
        ascii=$(printf '%d' "'$curchar")
        if [ $ascii -gt 91 ];
        then
                ascii=$((ascii-=96))
        else
                ascii=$((ascii-=38))
        fi
        tally+=$ascii
done
echo "$tally"