erikmd

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1b
• Decimal: 27

erikmd

(*
   Interactive approach
   --------------------

   You can copy-paste code into `utop`, provided you load the lwt.unix
   package:

     #use "topfind";;
     #thread;;  (* only needed in the plain `ocaml` toplevel, not in `utop`. *)
     #require "lwt.unix";;

erikmd

1. Create SSH keypair

In order to deploy using SSH, we need a SSH keypair. Please use an algorithm strong enough and also supported by GHA and your remote host.

You can use the command below to generate a keypair:

ssh-keygen -t ed25519 -C gha@vm-YourLogin -f ~/.ssh/id_gha

For this use case, don't use a passphrase (just type Return to select an empty passphrase).

erikmd

#!/usr/bin/env python3
"""
License: MIT License
Copyright (c) 2023 Miel Donkers

Very simple HTTP server in python for logging requests
Usage::
    ./server.py [<port>]
"""
from http.server import BaseHTTPRequestHandler, HTTPServer

erikmd

C99 List of Undefined Behavior

From N1256: (See http://port70.net/~nsz/c/c99/n1256.html#J.2)

• A "shall" or "shall not" requirement that appears outside of a constraint is violated (clause 4).
• A nonempty source file does not end in a new-line character which is not immediately preceded by a backslash character or ends in a partial preprocessing token or comment (5.1.1.2).
• Token concatenation produces a character sequence matching the syntax of a universal character name (5.1.1.2).
• A program in a hosted environment does not define a function named main using one of the specified forms (5.1.2.2.1).
• A character not in the basic source character set is encountered in a source file, except in an identifier, a character constant, a string literal, a header name, a comment, or a preprocessing token that is never converted to a token (5.2.1).
• An identifier, comment, string literal, character constant, or header name contains an invalid multibyte character or does not

erikmd

#!/bin/bash

usage="
Usage:
 wall [options] [message]

Write a message to all users.

Options:
 -n, --nobanner          do not print banner

erikmd

(* val type_ : Yojson.Safe.t -> [ `Plan | `State | `Unknown ] *)

let type_ json =
  let module Plan = struct
    type t = {
      terraform_version : string;
      planned_values : Yojson.Safe.t;
    }
    [@@deriving of_yojson { strict = false }]
  end in