Many operating system merge I/O devices and files into a combined file because of the similarity of system calls for each.

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Quizplus · Accepted Answer

Many operating systems treat I/O devices and files as a combined file because the system calls for reading and writing to them are often very similar. For example, reading from a file and reading from a keyboard can be accomplished with the same system call, which makes the operating system more efficient and easier to use.

Many Operating System Merge I/O Devices and Files into a Combined