In Unix-like operating systems, a program initializes access to a file in a file system using the open system call. This allocates resources associated to the file (the file descriptor), and returns a handle that the process will use to refer to that file.
In Unix-like operating systems, a program initializes access to a file in a file system using the open system call. This allocates resources associated to the file (the file descriptor), and returns a handle that the process will use to refer to that file.
Source: Wikipedia "Open (system call)" · CC BY-SA 4.0
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