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#File Magic Numbers

Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.

For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.

This gives an ongoing list of file-type magic numbers.

##Image Files

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""" Calculate the subnet mask, its binary representation, number of host and
	network bits, and the total number of hosts for a given CIDR address.
		Usage: python cidr.py [cidr]
		Notes: Pipe the command to jq to pretty print the JSON. Python 2 or 3 compatible.
		Examples:
		python cidr.py 10.0.0.0/24
		python cidr.py 172.0.0.0/16 | jq
"""

from __future__ import print_function

ldong

Zip excluding specific directories

Exclude .git file and node_modules directory

$ zip -r9 [target_file] [source_file] -x *.git* node_modules/\*

Exclude .git file and files in node_modules directory, but keep node_modules directory

$ zip -r9 [target_file] [source_file] -x *.git* node_modules/**\*

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# This script was created to convert a directory full
# of markdown files into rst equivalents. It uses
# pandoc to do the conversion.
#
# 1. Install pandoc from http://johnmacfarlane.net/pandoc/
# 2. Copy this script into the directory containing the .md files
# 3. Ensure that the script has execute permissions
# 4. Run the script
#
# By default this will keep the original .md file

ldong

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

OP: @leonardofed founder @ plainflow.

---

ldong

$ node index.js
status quo x 183,314 ops/sec ±7.01% (81 runs sampled)
comma fix x 88,004 ops/sec ±5.18% (81 runs sampled)
alternate fix x 88,608 ops/sec ±4.89% (84 runs sampled)
regex match fix x 36,670 ops/sec ±5.04% (83 runs sampled)
iteration fix x 175,519 ops/sec ±5.20% (84 runs sampled)
nested x 88,474 ops/sec ±3.91% (82 runs sampled)

ldong

var assert = require('assert')
var util = require('util')

function test (inherits) {
    function Fruit () {

    }
    Fruit.prototype.round = false
    Fruit.prototype.sweet = true
    Fruit.prototype.eat = function () {}

ldong

var assert = require('assert')
var util = require('util')

function test (inherits) {
    function Fruit () {

    }
    Fruit.prototype.round = false
    Fruit.prototype.sweet = true
    Fruit.prototype.eat = function () {}

ldong

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

ldong

One-liners

Reverse every line:

Input file:

$ cat foo
qwe
123

bar