Execute bash script from URL
What is Bash?
Bash is a "Unix shell": a command line interface for interacting with the operating system. It is widely available, being the default shell on many GNU/Linux distributions and on Mac OSX, with ports existing for many other systems. It was created in the late 1980s by a programmer named Brian Fox, working for the Free Software Foundation. It was intended as a free software alternative to the Bourne shell (in fact, its name is an acronym for Bourne Again SHell), and it incorporates all features of that shell, as well as new features such as integer arithmetic and job control
Shell scripting
In addition to the interactive mode, where the user types one command at a time, with immediate execution and feedback, Bash (like many other shells) also has the ability to run an entire script of commands, known as a "Bash shell script" (or "Bash script" or "shell script" or just "script"). A script might contain just a very simple list of commands — or even just a single command — or it might contain functions, loops, conditional constructs, and all the other hallmarks of imperative programming. In effect, a Bash shell script is a computer program written in the Bash programming language.
Shell scripting is the art of creating and maintaining such scripts. Shell scripts can be called from the interactive command-line described above; or, they can be called from other parts of the system. One script might be set to run when the system boots up; another might be set to run every weekday at 2:30 AM; another might run whenever a user logs into the system.
Bash from URL
Most recently it's become the common fashion to execute bash script from URL. Where scripts were hosted in a centralized server and anybody could access and execute it using HTTP. It's little bit tricky but very easy to update, maintains and execute from a centralized server. In case of support for backward compatibility can maintains the version. For example:
Chorke, Inc. need to maintains a big size of Open Source Community. It's community demand to keep them up to date with the continuous integration, build and deployment systems. By which it will be reduce the difficulties, simplified teamwork and contribution to Chorke, Inc.. This community challenges overcomes by the of Chorke, Inc.'s official bash script page as following:
# using curl from http://cdn.chorke.org/bash
bash <(curl -s http://cdn.chorke.org/bash/zend/pull)
# using wget from http://cdn.chorke.org/bash
bash <(wget -qO- http://cdn.chorke.org/bash/zend/pull)