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#!/bin/sh
# This is slow, but it’s fun! That’s what counts!
while IFS='[]' read -r line cksum; do
sid=`echo $line | grep -o '[0-9]*'`
echo $line \
| tr -d -- '-0-9\n' \
| sed 's/./&\n/g' \
| sort \
| uniq -c \
| sort -k1nr \
| head -n5 \
# START PART 1
| awk "{ s = s \$2 } END { if (s == \"$cksum\") print $sid }"
done <input | awk '{ s += $0 } END { print s }'
# END PART 1 START PART 2
| awk "{ s = s \$2 } END { if (s == \"$cksum\") print \"$line\" }"
done <input | \
while read -r line; do
for i in `seq 25`; do
echo $line | tr $(printf %${i}s | tr ' ' '.')\a-z a-za-z
done
# The call to head(1) allows us to exit the moment we find the
# first match.
done | grep north | grep -o '[0-9]*' | head -n1
# END PART 2
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