05-07-2013
It is fairly common practice when writing software that is to be used in multiple operating environments to use a scheme like one of these as a configuration option when installing the software. Obviously the copyrighted code in example 2 from HP configures itself each time the script runs based on the results of a call to uname. How the IBM script in example 1 and the nagios script in example 3 are setup may be hidden in the ... areas of the code you didn't show or during the installation of these scripts.
I don't know of any university course that teaches this style, but you can bet that HP, IBM, and Oracle have coding guidelines (and probably internal classes) that specify coding styles for these kinds of application scripts.
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