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isatty
======

Syntax
------

     #include <unistd.h>
     
     int isatty(int fd);

Description
-----------

Tells if the file descriptor refers to a terminal device or not.

Return Value
------------

Nonzero if FD is a terminal device, zero  otherwise.

Example
-------

     if (isatty(1))
       fflush(stdout);


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