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stderr is short for '''standard error'''.  It is always descriptor number 2 in a unix program.  In [[OpenBSD]] stderr can be represented as /dev/fd/2 or /dev/stderr.  You can see more about this by typing "man 4 stderr" or "man 4 fd".  Standard error is defined in /usr/include/unistd.h as a macro that is called STDERR_FILENO and its value is 2.

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