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stdin is short for '''standard input'''.  It is always descriptor number 0 in a unix program.  In [[OpenBSD]] stdin can be represented as /dev/fd/0 or /dev/stdin.  You can see more about this by typing "man 4 stdin" or "man 4 fd".  Standard input is defined in /usr/include/unistd.h as a macro that is called STDIN_FILENO and its value is 0.

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