How does a program execute with respect to the operating system?

Problem Detail: 

I am reading Operating Systems by William Stallings 6th edition and I came across this text,

Program execution:

A number of steps need to be performed to execute a program. Instructions and data must be loaded into main memory, I/O devices and files must be initialized, and other resources. 

Now I am unable to understand how I/O devices and files are initialized on program execution? I assume it meant to start the I/O resources but what about the files? Please guide. Thanks

Asked By : Fahad Uddin

Answered By : Alejandro Sazo

A initialized file means that you have comprobe that exist, or open it in some mode (write, read, r&w, etc) and create it if is not already.

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Question Source : http://cs.stackexchange.com/questions/11990