How to copy string as a word on Mac

It's annoying to double click to select text on Mac because when you double click, it only selects a single word, instead of the whole connected words. Here is the trick:

Shift + Cmd and then double click to select the text.

Speed up the up and down arrow keys on Mac

To change how fast a key repeats when holding it down, adjust this setting:

"System Preferences" | "Keyboard" | "Keyboard Tab" | "Keyboard Repeat"

To change how long you have to hold it down before it registers as repeating, adjust this setting:


"System Preferences" | "Keyboard" | "Keyboard Tab" | "Delay Until Repeat"

GIS frequently used commands

# To read the height file at row 683, column 120
gdallocationinfo N37W122.hgt 120 683

Virtual box cannot boot to GUI?

haha
1) Find the IP of your virtual box, say, 192.168.1.23
2) From your host machine: ssh 192.168.1.23
3) ssh console: sudo service lightdm start
4) The virtual box should start the GUI

Open Source Projects by Google, Facebook, LinkedIn and Netflix

Google - Open Source Projects Released By Google
Facebook - Our Projects
LinkedIn - Open Source | LinkedIn Engineering
Netflix - Netflix Open Source Software Center

How to fix Docker

Sometime the Docker won't stop and it just hangs on any commends.

So far I haven't figured out a way to fix it without rebooting the machine.

Even worse: docker daemon won't start after reboot. I need to reinstall docker to get it to work. And I had to use the following commands to uninstall and reinstall to make it work.

$ sudo apt-get autoremove --purge docker-engine
$ rm -rf /var/lib/docker
$ sudo apt-get install docker-engine

Google Maps S2 Cells

It uses Hilbert Curve to get the cell ids.