AoC 2020 day 1 bash

gistfile1.txt

#!/bin/bash

tmpfile=$(mktemp)
cat input-day1 > "$tmpfile"
for num1 in $(< "$tmpfile" )
do
    sed -ri "/^$num1$/d" "$tmpfile"
    for num2 in $(< "$tmpfile" )
    do
      if [ $num1 -eq $num2 ]
      then
        continue
      fi
      if [ $(( num1 + num2 )) -eq 2020 ]
      then
        echo "Found ${num1} + ${num2} = 2020, product = $(( num1 * num2 ))"
      fi
    done
done
rm -- "$tmpfile"