这些测试条件使你能够在 shell 脚本中检查文件系统中的文件。它们经常出现在需要进行文件访问的脚本中。

A few days ago, I built a website for showing traditional Chinese colours with bootstrap cards. Several issues I encountered during this process, just write them down for records.

编写第一个 shell 脚本，修改权限并执行它，也算是入门了！

It is said Yahoo finance closed the historical data API on May 18th 2017, but we can still download the data from the webpage. Here shows the way to download data using python request.

Recently when installing some gems, it popped out errors that telling the Ruby version is lower than required... I have to upgrade the shipped Ruby, version 2.0.0p648 (2015-12-16 revision 53162), on my machine. There are a few methods dealing with this, but I found the easiest way is using Homebrew.