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@node isatty
@section @code{isatty}
@findex isatty
POSIX specification: @url{http://www.opengroup.org/susv3xsh/isatty.html}
Gnulib module: ---
Portability problems fixed by Gnulib:
@itemize
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
On Windows, @code{isatty} also returns true for character devices such as
@file{NUL}.
@end itemize
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