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+#!/bin/sh
+
+# Download input from the Advent of Code website (https://adventofcode.com/).
+# Requires setting an AOC_SESSION_COOKIE variable with a valid session cookie.
+
+# usage: aocd [year n]
+# If year and n are not specified, the current year and day are used.
+
+YEAR="${1:-$(date +'%Y')}"
+DAY="${2:-$(date +'%d' | sed 's/^0//')}"
+URL="https://adventofcode.com/$YEAR/day/$DAY/input"
+
+curl "$URL" -H "cookie: session=$AOC_SESSION_COOKIE" -o input.txt