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zk/Operating_system_API.md
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@ -6,10 +6,10 @@ created: Wednesday, July 17, 2024
# Operating system API
A user can interact with the operating system either via the GUI or the shell.
(The UI is in fact an abstraction for interfacing with the shell.) When
_programs_ interact with the operating system they use the operating system's
API.
A user can interact with the operating system either via the GUI or the
[shell](Intro_to_the_Unix_shell.md). Both ultimately access the OS via the shell
since the UI is an abstraction layer of the shell. When _programs_ interact with
the operating system they use the **operating system's API**.
Every OS has an API. This specification details how a program should interact
with the OS, exposing functions, properties and data types.
@ -22,8 +22,11 @@ perform the action.
## Example: opening a file
A user can use a file explorer and the mouse to open a file. However a running
application doesn't have to do this. Instead it can call the OS API.
A user can use a file explorer and the mouse to open a file. Or they can open
the file by invoking it from the terminal.
A running application doesn't have to do this. If it's remit includes opening
files, it can do so by calling the OS API.
On a Unix-like system the applicaton would use the `open` API function to open
the file: