day6

PART2
#!/bin/bash
input=`cat input.txt`
for (( c=14; c -lt $(#input); c++ )); do
 if [ `echo ${input:((c-14)):14} | fold -w1 | sort -u | wc -l | xargs` -eq 14 ]; then
  echo "solution is: $c"
  break
 fi
done

PART1
#!/bin/bash
input=`cat input.txt`
for (( c=4; c -lt $(#input); c++ )); do
 if [ `echo ${input:((c-4)):4} | fold -w1 | sort -u | wc -l | xargs` -eq 4 ]; then
  echo "solution is: $c"
  break
 fi
done