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Original Source: https://www.math.brown.edu/johsilve/ReferenceCards/

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#!/bin/bash
#
# Generate Random MAC-address
#
# Locally administered:
#   X2-XX-XX-XX-XX-XX
#   X6-XX-XX-XX-XX-XX
#   XA-XX-XX-XX-XX-XX
#   XE-XX-XX-XX-XX-XX
#

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/*	HTMLDocumentEditor.java
 *	@author: Charles Bell
 *	@version: May 27, 2002	
 */

import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;

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Match: 0.0.0.0-255.255.255.255

Perl / PCRE

$input =~ /^(?:(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}(?1)$/;

grep -P '^(?:(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}(?1)$' <<<"$input"

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Instalacion y uso

Logueate en tu cuenta de Telegram desde https://my.telegram.org/

Ve a API Development toolsy de allí a Create new application, crea una con cualquier cosa, y modifica en el script API ID y API Hash

Dependencias

pip3 install telethon

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Screen Cheatsheet / Quick Reference (Pocket Friendly)

Escape Key

All screen commands are prefixed by an escape key, by default Ctrl-a (that's Control-a, sometimes written ^a). To send a literal Ctrl-a to the programs in screen, use Ctrl-a a. This is useful when when working with screen within screen. For example Ctrl-a a n will move screen to a new window on the screen within screen.

Description	Command
Basic
Start a new session with session name	screen -S

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tmux vs. screen commands

---

Action	tmux	screen
start a new session	tmux tmux new tmux new-session	screen
start a new session with a name	tmux new -s name	screen -S name
re-attach a detached session	tmux attach tmux attach-session	screen -r
re-attach a detached session with a name	tmux attach -t name tmux a -t name	screen -r name
re-attach an attached session (detaching it from elsewhere)	tmux attach -dtmux attach-session -d	screen -dr

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#!/usr/bin/env python3
#
# Decompressor/compressor for files in Mozilla's "mozLz4" format. Firefox uses this file format to
# compress e. g. bookmark backups (*.jsonlz4).
#
# This file format is in fact just plain LZ4 data with a custom header (magic number [8 bytes] and
# uncompressed file size [4 bytes, little endian]).
#
# This Python 3 script requires the LZ4 bindings for Python, see: https://pypi.python.org/pypi/lz4
#

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To disable Web Push Notifications in Firefox, the following about:config must be set to false:

dom.webnotifications.enabled
dom.webnotifications.serviceworker.enabled
dom.push.connection.enabled
dom.push.enabled

Test Web Notifications:

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I/O Scheduler (sysfs / kernel-param)

/sys/block/*/queue/scheduler

noop deadline cfq

elevator=deadline

IPv6 disable (proc / kernel-param)

sysctl -w net.ipv6.conf.all.disable_ipv6=1

ipv6.disable=1

Clock Source (sysfs/ kernel-param)