Sharing a simple script I recently used. Because recent development, I need to run a build command which needs about 2-3 minutes. I run it in the background so that I can continue my other work.

But switching the window in order to check whether the build is completed, it is frustrating. To make it easy, I wrote the following script,

[code lang=bash] #!/bin/bash

notify-send -t 1500 -i applications-utilities “$@” aplay /usr/share/orage/sounds/Knock.wav &> /dev/null [/code]

I recently wrote a Perl script, that renames the files in a directory according to the date, in the format “YYYYMMDD ##” where “##” is the running number.

Rationale

Because I used to download the photos using the mobile apps like Weibo or Twitter, however the file names are almost random. This made me hard to organize these photos on my computer.

The artists (or celebrities) usually share a set of their photos, so when I download these photos, the files should have mtime (modified time) in the correct order.

Monty Hall paradox

Probability topic is the fundamental concept of the statistics. And machine learning is closely related to statistics. That is why, understand the probability very important if you are doing research, statistics, and machine learning.

Monty Hall is a very interesting problem. It says, if you are given 3 doors to choose. One of them contains a car (which you want), the other two are goats (which you don’t want). After you made your choice, before opening the door, the host will open the door that you didn’t choose yet contains the goat (he knows which door has the goat). Now, if you are given an opportunity to change your choice to another door (which you didn’t choose earlier), are you going to change?

Because I am using the Openbox (window manager), and I believe that the laptop Fn+F8 (or whatever combination with Fn) doesn’t work properly on Linux. Because the combination is detected as Super+p (aka Win+p). As a result, I wrote a Perl script to solve the switching display/monitor/screen issue on my laptop.

[code language=“perl”] #!/usr/bin/perl

# This script requires xrandr, and several bash script created by arandr

use strict; use warnings;

Have you downloaded the videos online, such as Youku, Tudou, or even YouTube? Have you downloaded the videos which the uploaders split the them into several parts?

Whatever your answer is, you may face the same problem as me.

I downloaded the videos to watch later. But the videos are split into several parts. I wish to watch it as a whole (because it should be one big file). So, I created this script to solve the problem. This script requires MP4Box (in the gpac package) and FFmpeg.