githubutilities

According to wikipedia, Avahi is a free zero-configuration networking (zeroconf) implementation, including a system for multicast DNS/DNS-SD service discovery.

1. build dependent libs, refer to avahi download page

• gettext

    brew link --force gettext
    brew unlink gettext

• intltool

githubutilities

I got a gif file from google homepage but I want to convert it to more general mp4 file in order to share through wechat, but most of the solution I found on the internet suggest that I should combile imagemagick and ffmpeg to accomplish this. Here it's the interesting fact that most of the scripts does not work on mac os x mavericks.

Here is the solution I got:

ffmpeg -i lunar-new-year-2015-5753824463552512-hp.gif -pix_fmt yuv420p out.mp4

This command also proves useful, it can split gif file to pngs

githubutilities

vpn on demand with zero

githubutilities

Here is a list of OCR software:

1. Ocrad

This also gets a JS version, but same as Ocrad, the result is not promising.

2. GOCR

It got better result than Ocrad and 'so-called' more format support. You can use imagemagick to convert images to supported format

3. tesseract

githubutilities

Notification center is an alert system to deal with push and local notification for iOS5 or later and OSX 10.8 or later. I think it is an amazing feature for apple device but as the number of your installed app grown, your notification center may fill with noice and the notified feature may less likely hit the important thing. And here is some tricks that I use to reduce the noices:

• pay attention to your notification center and mark the noicy app then go to setting > notificafion center to mute or change that app

Some improvement ideas:

• notification should be smart enough to tell the important messages and notify users with differrence sound length
• for apple device users should have more option on setting the notificafion center to optimize this feature

githubutilities

Windows Package Manager

Using Scoop

Scoop is Homebrew alternative for windows.

# command prompt theme
scoop install concfg
concfg import solarized small

githubutilities

Show hidden password

Type javascript:alert(document.getElementById('password').value) into address bar or run document.getElementById('password').value in developer console, you will get the password.

Make any webpage editable

document.body.contentEditable='true'; document.designMode='on';

githubutilities

Remove image metadata(exif data) to protect privacy

# use exiftool
exiftool –all= your-image-file.jpg

Reference

• Protect Your Online Privacy by Removing Exif Data from Your Photos

githubutilities

Interesting TCP three way handshake

It's not hard to find out when we communicate using Instant Message Tools, we often apply TCP three way handshake for important messages. I send a important message(appended with if you receive this message, please reply) to you, and I am so paranoid that I need your reply or I will constantly send you that message until you reply. When I get your reply and maybe you are paranoid as I am, you may need me to comfirm that I have received your reply.

githubutilities

Multiple SSH Keys settings for different github account

create different public key

create different ssh key according the article Mac Set-Up Git

$ ssh-keygen -t rsa -C "[email protected]"