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Which of the following system call uses file descriptor as an argument?

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Which of the following system call uses file descriptor as an argument?

(a) read

(b) write

(c) close

(d) read, write, close
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Right answer is (d) read, write, close

The best I can explain: A file descriptor is an integer which is allocated when a file is opened. It is used by all system calls that perform some operations on file -like read, write, close, lseek.
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