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//from http://stackoverflow.com/questions/9847580/how-to-detect-safari-chrome-ie-firefox-and-opera-browser

var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    // Opera 8.0+ (UA detection to detect Blink/v8-powered Opera)
var isFirefox = typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
    // At least Safari 3+: "[object HTMLElementConstructor]"
var isChrome = !!window.chrome && !isOpera;              // Chrome 1+
var isIE = /*@cc_on!@*/false || !!document.documentMode;   // At least IE6

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Create an SSH key in PEM format

I have not been able to use ssh-keygen -e to reliably generate a private key for SSH in PEM format. This format is sometimes used by commercial products. Instead, I had to convert the key using openssl.

# generate an RSA key of size 2048 bits
ssh-keygen -t rsa -b 2048 -f jabba -C 'ronnie-jabba'

# copy key to 10.1.56.50 and add to authorized_keys

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find . -name '*.png' -exec pngquant --ext .png --force {} \;

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NGINX Performance Tuning

Content Compressions and Decompression

• Documentation
  • NGINX http_gzip module
  • NGINX http_gunzip module
• Enable gzip. by default, we’re not going to compress the responses that we’re getting from proxied servers or any piece of content that isn’t HTML.
• But if one of our proxied servers happens to send us a pre-compressed response then we probably want to decompress it for clients that can’t handle gzip. In this situation, we’ll use the gunzip module

  $ vim /etc/nginx/nginx.conf

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Can I Remove MySQL Binary Log Yes, as long as the data is replicated to Slave server, it’s safe to remove the file. It’s recommend only remove MySQL Binary Log older than 1 month.

Besides, if Recovery of data is the main concern, it’s recommend to archive MySQL Binary Log.

There are several ways to remove or clean up MySQL Binary Log, it’s not recommend to clean up the file manually, manually means running the remove command.

Remove MySQL Binary Log with RESET MASTER Statement Reset Master statement is uses for new database start up during replication for Master and Slave server. This statement can be used to remove all Binary Log.

To clean up Binary Log on Master Server

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JPG and PNG image bulk optimization

Install jpegoptim and optipng

apt update && apt install jpegoptim optipng -y

JPG optimization

cd /path/to/your/image/folder

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<?php
function get_youtube_video_ID($youtube_video_url) {
  /**
  * Pattern matches
  * http://youtu.be/ID
  * http://www.youtube.com/embed/ID
  * http://www.youtube.com/watch?v=ID
  * http://www.youtube.com/?v=ID
  * http://www.youtube.com/v/ID
  * http://www.youtube.com/e/ID

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{ fontWeight: '100' }, // Thin
{ fontWeight: '200' }, // Ultra Light
{ fontWeight: '300' }, // Light
{ fontWeight: '400' }, // Regular
{ fontWeight: '500' }, // Medium
{ fontWeight: '600' }, // Semibold
{ fontWeight: '700' }, // Bold
{ fontWeight: '800' }, // Heavy
{ fontWeight: '900' }, // Black

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import java.io.*;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.LinkedHashMap;
import javax.sound.sampled.*;
// Copy from https://stackoverflow.com/questions/10397272/wav-file-convert-to-byte-array-in-java
/**
 * This class reads a .wav file and converts it to a bunch of byte arrays.
 * 
 * The info represented by these byte arrays is then printed out.

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Homebrew

How To

Homebrew is a package management system for OS X. You can read more about it here, or simply run

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

to install it.