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\section isatty isatty - test if the specidied file descriptor is a tty
\subsection isatty-synopsis Synopsis
<tt>isatty [FILE DESCRIPTOR]</tt>
where FILE DESCRIPTOR may be either the number of a file descriptor, or one
of the strings stdin, stdout and stderr.
If the specified file descriptor is a tty, the exit status of the
command is zero, otherwise, it is non-zero.
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