This repository contains solutions to the 2021 Advent of Code written in the “little languages” of UNIX.
The solutions run directly from source and are intended to conform to the POSIX.1-2017 standard.
- sh - shell, the standard command language interpreter
- awk - pattern scanning and processing language
- bc - arbitrary-precision arithmetic language
- sed - stream editor
| Day 1 | Day 2 | Day 3 | Day 4 | Day 5 |
| Day 6 | Day 7 | Day 8 | Day 9 | Day 10 |
| Day 11 | Day 12 | Day 13 | Day 14 | Day 15 |
| Day 16 | Day 17 | Day 18 | Day 19 | Day 20 |
| Day 21 | Day 22 | Day 23 | Day 24 | Day 25 |
Each solution consists of a main executable file named solve, and
optionally additional source files, in a subdirectory of src/
corresponding to the day and problem. The solve program makes the
following assumptions about its environment:
- The
TMPDIRenvironment variable will be set to the path of a writable temporary directory. - The current working directory will be set to the parent directory of the
solveprogram. - The program will read the day’s input from stdin.
- The program will write its solution to stdout and exit with a status of zero.
The repository includes a built-in harness with scripts to fetch advent problem input, record verified output, and stub, run, and test each day’s solutions.
To evaluate a particular solution, run bin/aoc solve <day> <problem>,
where <day> is the advent day number and <problem> is 1 or 2.
To test each solution against the recorded output, run bin/aoc test.
© 2021 Sam Stephenson