mbelletti

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

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mdadm

Glossary:

• md: multiple devices

command	description
cat /proc/mdstat	show status of all raids
mdadm --detail /dev/md0	detailed status of raid md0

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# The code for my article with the same name. You can find it at the URL below:
# https://www.mvanga.com/blog/basic-music-theory-in-200-lines-of-python

# MIT License
# 
# Copyright (c) 2021 Manohar Vanga
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights

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(From http://stackoverflow.com/questions/2452861/python-library-for-converting-plain-text-ascii-into-gsm-7-bit-character-set, ran out of space in the comment section.)

Running the original file does not work in either Python 2 or 3.

In Python2, the program prints this:

64868d8d903a7390938d85

(which is wrong) because it is using the indexes of gsm which do not map to the index of their GSM encodings due to the fact that it is a bytestring with some characters taking up multiple bytes. gsm is actually equal to

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$ python xor.py
Training:
  Epoch   0   MSE: 1.765
  Epoch 100   MSE: 0.015
  Epoch 200   MSE: 0.005
  * Target MSE reached *
Evaluating:
  1 XOR 0 = 1 ( 0.904)   Error: 0.096
  0 XOR 1 = 1 ( 0.908)   Error: 0.092
  1 XOR 1 = 0 (-0.008)   Error: 0.008

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Keybase proof

I hereby claim:

• I am mbelletti on github.
• I am mbelletti (https://keybase.io/mbelletti) on keybase.
• I have a public key ASDZlvEC_Rppnz4vVIv1Y9UWC5sbqdcnukd8UbqtU606RAo

To claim this, I am signing this object:

mbelletti

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

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# -*- coding: utf-8 -*-

"""
    Adds some PostgreSQL jsonb support to pydal.
    Check https://www.postgresql.org/docs/9.6/static/functions-json.html for additional info.
    
    In order to use operators you must specify the 'jsonb' type on `Field` class.
    Included query operators:
        - `@>`: db.where(db.table.jsonb_field.jcontains({"foo": "bar"}))
        - `<@`: db.where(db.table.jsonb_field.jin({"foo": "bar"}))

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Creating a Happy Git Environment on OS X

Step 1: Install Git

brew install git bash-completion

Configure things:

git config --global user.name "Your Name"

git config --global user.email "you@example.com"

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/ip pool
add name=vpn-pool ranges=10.2.2.2-10.2.2.22

/ppp profile
set [find name=default-encryption] dns-server=10.2.2.1 local-address=10.2.2.1 remote-address=vpn-pool

/ppp secret
add name=帳號 password=密碼 profile=default

/interface l2tp-server server