Nice netcat...
There is a nice program that you can talk to by using this command in a shell: $ nc wily-courier.picoctf.net 53695, but it doesn't speak English...
Connect with nc wily-courier.picoctf.net 53695.
The service returned decimal numbers.
These numbers appear to represent ASCII characters. Convert them to text.
Save the decimal values in to_ascii.txt, one per line, for the script below. The inner printf converts each number to octal, and the outer printf interprets that octal escape as a character.
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#!/bin/bash
while read -r n; do
printf "\\$(printf '%03o' "$n")"
done < to_ascii.txt
echo
Run this script to get the flag!
This post is licensed under CC BY 4.0 by the author.