Reiner xieyunzi

Terminal Colors

There exists common confusion about terminal colors. This is what we have right now:

Plain ASCII
ANSI escape codes: 16 color codes with bold/italic and background
256 color palette: 216 colors + 16 ANSI + 24 gray (colors are 24-bit)
24-bit true color: "888" colors (aka 16 milion)

If you are getting this in gdb on macOS while trying to run a program:

Unable to find Mach task port for process-id 57573: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))

Open Keychain Access
In menu, open Keychain Access > Certificate Assistant > Create a certificate
Give it a name (e.g. gdbc)

BUILD_DIR = build

all: directories build

directories:
	mkdir -p $(BUILD_DIR)

build:
	gcc -c -o $(BUILD_DIR)/test test.c

This is a little trick I use to spin up the packages instalation on Debian/Ubuntu boxes in Vagrant.

I add a simple function that checks if a directory named something similar to ~/.vagrant.d/cache/apt/opscode-ubuntu-12.04/partial (it may have another path in Windows or MacOS) and create the directory if it doesn't already exist.

def local_cache(basebox_name)
  cache_dir = Vagrant::Environment.new.home_path.join('cache', 'apt', basebox_name)
  partial_dir = cache_dir.join('partial')
  partial_dir.mkdir unless partial_dir.exist?
 cache_dir

	#!/bin/bash --
	#
	# display ANSI colours and test bold/blink attributes
	# orginates from Eterm distribution
	#-------------------------------------------------------------------------

	ESC=$'\x1b'
	CSI="${ESC}["
	RST="${CSI}m"

	#!/usr/bin/perl
	# Author: Todd Larason <[email protected]>
	# $XFree86: xc/programs/xterm/vttests/256colors2.pl,v 1.1 1999/07/11 08:49:54 dawes Exp $

	print "256 color mode\n\n";

	# display back ground colors

	for ($fgbg = 38; $fgbg <= 48; $fgbg +=10) {

	from scapy.all import *

	def main():
	"""
	"""
	packet = IP(dst="192.168.100.123")/TCP()/"from scapy packet"
	send(packet)


	def packet_with_seq_n():

	;; idea from https://stackoverflow.com/questions/11676120/why-dont-when-let-and-if-let-support-multiple-bindings-by-default
	(defmacro if->
	"Use this to avoid `if else nested hell`.
	(if-> [true (prn 1) (prn 2) true (prn 3) (prn 4) false (prn 5) (prn 6)])"
	[bindings]
	(if (seq bindings)
	`(if ~(first bindings)
	(let [r# ~(second bindings)]
	(or (if-> ~(vec (drop 3 bindings)))
	r#))

	CFLAGS= -I../include

	# https://stackoverflow.com/questions/22551167/using-a-result-of-shells-find-as-a-target-in-a-makefile
	sources = $(shell find . -maxdepth 1 -name '*.c')
	include $(sources:.c=.d)

	# http://www.microhowto.info/howto/automatically_generate_makefile_dependencies.html
	# generate dependencies
	%.d: %.c
	@set -e; rm -f $@; \