System Calls | Read | Write | Open | Close | Linux

Question

In my university we should install the virtualbox and Debian to use Linux. This is done and works yet. But for the first task we should use the systemcalls open(2), read(2), write(2) and close(2). Everytime i open the Terminal and enter this functions, it doesent works.

I know this is a really stupid question, but I can't do anything with these functions.

We should use the Read | Write | Open | Close that /proc/interrupts reads and outputs to standard output. How does it works?

Answer 1

open(2) , read(2) , write(2) and close(2) are not commands or shell builtins, they're syscalls - a part of Linux API. You can read more about syscalls by running man syscalls in the terminal on your machine and get help about each of them by running man 2 open , man 2 read etc.