wongsyrone

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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#!/usr/bin/env bash

# To fix the " gpg: WARNING: unsafe permissions on homedir '/home/path/to/user/.gnupg' " error
# Make sure that the .gnupg directory and its contents is accessibile by your user.
chown -R $(whoami) ~/.gnupg/

# Also correct the permissions and access rights on the directory
chmod 600 ~/.gnupg/*
chmod 700 ~/.gnupg

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This is a technique for extracting all imported modules from a packaged Python application as .pyc files, then decompiling them. The target program needs to be run from scratch, but no debugging symbols are necessary (assuming an unmodified build of Python is being used).

This was originally performed on 64-bit Linux with a Python 3.6 target. The Python scripts have since been updated to handle pyc files for Python 2.7 - 3.9.

Theory

In Python we can leverage the fact that any module import involving a .py* file will eventually arrive as ready-to-execute Python code object at this function:

PyObject* PyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals);

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KVM OSX Guest 10.11 (El Capitan) with Clover

• Some notes about this approach:
  • An OSX Installer USB drive for Install OS X El Capitan is created
  • Clover is then installed on the USB drive
  • Clover Configurator is then run on the USB drive
  • The USB drive contents are copied to the VM host
  • VNC is used to connect to the guest UI
• The qxl virtual video device is used (part of the standard kvm qemu install)

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# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/dhparam.pem 2048

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Building OpenSSL 1.1.0 with Microsoft VS 2015

MCCI needs OpenSSL for a Windows project (that will be cross-platform). A casual search didn't turn up either a good source for cross-platform libraries, which meant we have to build them ourselves. A deeper search found a detailed guide here, and yet the details don't match what I found when I checked out the code; and the post doesn't talk about doing it directly from GitHub (which I wanted to do).

Here's the procedure for building OpenSSL on 64-bit Windows 10, with Visual Studio 2015.

1. If you don't have it, please install git bash from git-scm.com.
2. Start a git bash window.

   In the following, I'll use lines beginning with {dir} $ to designate input to a bash Window. We'll also have to use a cmd.exe Window for much of the build, and those lines will be marked {dir}>, just as on Windows..

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ln -sf /usr/share/zoneinfo/$(tzselect) /etc/localtime
hwclock --systohc

nano /etc/locale.gen && locale-gen
read -p "Default LANG is? [en_US,zh_CN...]" loc
echo "LANG=$loc.UTF-8" >> /etc/locale.conf

read -p "Hostname is?" hn
echo $hc > /etc/hostname
echo "127.0.1.1\t$hc.localdomain\t$hc" > /etc/hosts

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#!/bin/bash

#check network connection
con=$(ping -q -w 1 -c 1 `ip r | grep default | cut -d ' ' -f 3` > /dev/null && echo ok || echo error)
if [ $con == "error" ]; then
    exit -1
fi

timedatectl set-ntp true
lsblk

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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Table Of Content

Skip to the relevant sections if needed.

• 2-min tutorial to do it the quick-and-dirty-way
• Concepts for resolving Git conflicts
• Setting up different editors / tool for using git mergetool
  • Finding out what mergetool editors are supported
• mergetool simple code example for vimdiff
  • Resolving conflict from a Git pull
• Other great references and tutorials