#!/bin/bash

if [ -e "$1" ]; then
    file="$1"
else
    echo 'CANNOT FIND LOG FILE'
    exit 1
fi

if [ -n "$2" ]; then
    output="$2"
    echo "Outputting IDs to $output"
else
    output="successful.txt"
fi

grep 'Downloaded submission' "$file" | awk '{ print $(NF-2) }' >> "$output"