advent_of_code_2020_day4_part1

#!/bin/bash

required_fields="byr iyr eyr hgt hcl ecl pid"
while read line
do
  # read through until blank line or end of file to capture a full passport
  if [ -z "$line" ]
  then
    for field in $required_fields
    do
      exists=$(echo $passport | grep -c "$field:")
      if [ $exists -eq 0 ]
      then
        invalid=$(($invalid+1))
        missing="$missing $field"
        continue
      fi
    done
    if [ "{$missing}" == "{}" ]
    then
      valid=$(($valid + 1))
    fi
    missing=""
    passport=""
    continue
  fi
  passport="$passport $line"
done <<< $(<$1)

echo $valid